2021

• Seidling M., Zimmermann R., Hommelhoff P.:
  Chip-based electrostatic beam splitting of guided kiloelectron volt electrons
  In: Applied Physics Letters 118 (2021), Art.Nr.: 034101
  ISSN: 0003-6951
  DOI: 10.1063/5.0030049
  URL: https://aip.scitation.org/doi/abs/10.1063/5.0030049
• Zimmermann R., Seidling M., Hommelhoff P.:
  Charged particle guiding and beam splitting with auto-ponderomotive potentials on a chip
  In: Nature Communications 12 (2021), Art.Nr.: 390
  ISSN: 2041-1723
  DOI: 10.1038/s41467-020-20592-4
  URL: https://www.nature.com/articles/s41467-020-20592-4

2020

• Boolakee T., Heide C., Wagner F., Ott C., Schlecht MT., Ristein J., Weber HB., Hommelhoff P.:
  Length-dependence of light-induced currents in graphene
  In: Journal of Physics B-Atomic Molecular and Optical Physics (2020)
  ISSN: 0953-4075
  DOI: 10.1088/1361-6455/ab9075
  URL: https://iopscience.iop.org/article/10.1088/1361-6455/ab9075
• Deng H., Leedle KJ., Miao Y., Black DS., Urbanek KE., McNeur J., Kozak M., Ceballos A., Hommelhoff P., Solgaard O., Byer RL., Harris JS.:
  Gallium Oxide for High-Power Optical Applications
  In: Advanced Optical Materials (2020)
  ISSN: 2195-1071
  DOI: 10.1002/adom.201901522
• Heide C., Boolakee T., Higuchi T., Hommelhoff P.:
  Sub-cycle temporal evolution of light-induced electron dynamics in hexagonal 2D materials
  In: JPhys Photonics (2020)
  ISSN: 2515-7647
  DOI: 10.1088/2515-7647
  URL: https://iopscience.iop.org/article/10.1088/2515-7647/ab7d82
• Heide C., Hauck M., Higuchi T., Ristein J., Ley L., Weber HB., Hommelhoff P.:
  Attosecond-fast internal photoemission
  In: Nature Photonics 14 (2020), S. 219–222
  ISSN: 1749-4885
  DOI: 10.1038/s41566-019-0580-6
  URL: https://arxiv.org/abs/2001.02989
• Heimerl J., Higuchi T., Ammon M., Schneider MA., Hommelhoff P.:
  Gap-size dependence of optical near fields in a variable nanoscale two-tip junction
  In: Physical Review B 101 (2020), Art.Nr.: 125403
  ISSN: 2469-9950
  DOI: 10.1103/PhysRevB.101.125403
• Morimoto Y., Hommelhoff P.:
  Intracycle interference in the interaction of laser and electron beams
  In: Physical Review Research (2020), Art.Nr.: 043089
  ISSN: 2643-1564
  DOI: 10.1103/PhysRevResearch.2.043089
  URL: https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.043089

2019

• Dienstbier P., Tani F., Higuchi T., Travers JC., Russell PSJ., Hommelhoff P.:
  Generation of 1.5 cycle pulses at 780 nm at oscillator repetition rates with stable carrier-envelope phase
  In: Optics Express 27 (2019), S. 24105 - 24113
  ISSN: 1094-4087
  DOI: 10.1364/OE.27.024105
  URL: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-17-24105
• Ermolov A., Heide C., Dienstbier P., Köttig F., Tani F., Hommelhoff P., Russell PS.:
  Carrier-envelope-phase-stable soliton-based pulse compression to 4.4  fs and ultraviolet generation at the 800  kHz repetition rate
  In: Optics Letters 44 (2019), S. 5005-5008
  ISSN: 0146-9592
  DOI: 10.1364/OL.44.005005
  URL: https://www.osapublishing.org/ol/abstract.cfm?uri=ol-44-20-5005
• Ermolov A., Heide C., Dienstbier P., Tani F., Köttig F., Hommelhoff P., Russell PSJ.:
  CEP-stable generation of close to single-cycle and ultrashort UV pulses at 800 kHz repetition rate using a gas-filled hollow-core PCF
  2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 (Munich, 23. Juni 2019 - 27. Juni 2019)
  In: 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 2019
  DOI: 10.1109/CLEOE-EQEC.2019.8872709
• Heide C., Boolakee T., Higuchi T., Weber HB., Hommelhoff P.:
  Interaction of carrier envelope phase-stable laser pulses with graphene:the transition from the weak-field to the strong-field regime
  In: New Journal of Physics (2019), Art.Nr.: 045003
  ISSN: 1367-2630
  DOI: 10.1088/1367-2630/ab13ce
  URL: https://arxiv.org/abs/1903.07558
• Heide C., Higuchi T., Ullmann K., Weber HB., Hommelhoff P.:
  Lightwave-controlled electron dynamics in graphene
  XXI International Conference on Ultrafast Phenomena 2018 (UP 2018)
  In: EPJ Web Conf. (Hrsg.): 205 2019
  DOI: 10.1051/epjconf/201920505002
  URL: https://www.epj-conferences.org/articles/epjconf/abs/2019/10/epjconf_up2019_05002/epjconf_up2019_05002.html
• Hoff D., Krüger M., Maisenbacher L., Sayler AM., Paulus GG., Hommelhoff P.:
  Tracing the phase of focused broadband laser pulses
  2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 (Munich, 23. Juni 2019 - 27. Juni 2019)
  In: 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 2019
  DOI: 10.1109/CLEOE-EQEC.2019.8871697
• Kozak M., Higuchi T., McNeur J., Shiloh R., Heide C., Paschen T., Yousefi P., Sturm C., Li A., Illmer J., Meier S., Schönenberger N., Dienstbier P., Tafel A., Weber P., Zimmermann R., Seidling M., Mittelbach A., Heimerl J., Eckstein T., Hundhausen M., Ristein J., Hommelhoff P.:
  From strong-field physics in and at nanoscale matter to photonics-based laser accelerators
  XXI International Conference on Ultrafast Phenomena 2018 (UP 2018)
  In: 205 2019
  DOI: 10.1051/epjconf/201920508009
  URL: https://www.epj-conferences.org/articles/epjconf/abs/2019/10/epjconf_up2019_08009/epjconf_up2019_08009.html
• Niedermayer U., Adelmann A., Bettoni S., Calvi M., Dehler M., Ferrari E., Frei F., Hauenstein D., Hermann B., Hiller N., Ischebeck R., Lombosi C., Eduard P., Reiche S., Rivkin L., Aßmann R., Dorda U., Hartl I., Kuropka W., Lemery F., Marchetti B., Mayet F., Xuan H., Zhu J., Balck DS., Broaddus PN., Byer R., Ceballos A., Deng H., Fan S., Harris J., Hirano T., Hughes T., Jiang Y., Langenstein T., Leedle K., Miao Y., Ody A., Pigott A., Sapra N., Solgaard O., Su L., Tan S., Vuckovic J., Yang K., Zhao Z., Boine-Frankenheim O., Egenolf T., Skär E., Cesar D., Musumeci P., Naranjo B., Rosenzweig J., Shen XF., Cowan B., England RJ., Huang Z., Cankaya H., Fakhari M., Fallahi A., Kärtner FX., Feurer T., Hommelhoff P., Illmer J., Li A., Mittelbach A., McNeur J., Schönenberger N., Shiloh R., Tafel A., Yousefi P., Kozak M., Qi M., Lee YJ., Huang YC., Simakov E.:
  Challenges in simulating beam dynamics of dielectric laser acceleration
  In: International Journal of Modern Physics A 34 (2019), Art.Nr.: 1942031
  ISSN: 0217-751X
  DOI: 10.1142/S0217751X19420314
  URL: https://www.worldscientific.com/doi/abs/10.1142/S0217751X19420314
• Paschen T., Förster M., Krüger M., Lemell C., Wachter G., Libisch F., Madlener T., Burgdoerfer J., Hommelhoff P.:
  Two-color phase-controlled photoemission from a zero-dimensional nanostructure
  XXI International Conference on Ultrafast Phenomena 2018 (UP 2018)
  In: EPJ Web Conf. (Hrsg.): 205 2019
  DOI: 10.1051/epjconf/201920505004
  URL: https://www.epj-conferences.org/articles/epjconf/abs/2019/10/epjconf_up2019_05004/epjconf_up2019_05004.html
• Schönenberger N., Mittelbach A., Yousefi P., McNeur J., Niedermayer U., Hommelhoff P.:
  Generation and Characterization of Attosecond Microbunched Electron Pulse Trains via Dielectric Laser Acceleration
  In: Physical Review Letters 123 (2019), Art.Nr.: 264803
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.123.264803
  URL: https://arxiv.org/abs/1910.14343
• Tafel A., Meier S., Ristein J., Hommelhoff P.:
  Femtosecond Laser-Induced Electron Emission from Nanodiamond-Coated Tungsten Needle Tips
  In: Physical Review Letters 123 (2019), Art.Nr.: 146802
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.123.146802
  URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.146802
• Tafel A., Wu M., Spiecker E., Hommelhoff P., Ristein J.:
  Fabrication and structural characterization of diamond-coated tungsten tips
  In: Diamond and Related Materials 97 (2019), Art.Nr.: 107446
  ISSN: 0925-9635
  DOI: 10.1016/j.diamond.2019.107446
• Wu M., Tafel A., Hommelhoff P., Spiecker E.:
  Determination of 3D electrostatic field at an electron nano-emitter
  In: Applied Physics Letters 114 (2019), S. 013101
  ISSN: 0003-6951
  DOI: 10.1063/1.5055227
  URL: http://aip.scitation.org/doi/10.1063/1.5055227
• Wu M., Tafel A., Hommelhoff P., Spiecker E.:
  Three-Dimensional Electrostatic Field at an Electron Nano-Emitter Determined by Differential Phase Contrast in Scanning Transmission Electron Microscopy
  In: Microscopy and Microanalysis 25 (2019), S. 74-75
  ISSN: 1431-9276
  DOI: 10.1017/S1431927619001107
• Yousefi P., Schönenberger N., McNeur J., Kozak M., Niedermayer U., Hommelhoff P.:
  Dielectric laser electron acceleration in a dual pillar grating with a distributed Bragg reflector
  In: Optics Letters 44 (2019), S. 1520-1523
  ISSN: 0146-9592
  DOI: 10.1364/OL.44.001520
  URL: https://arxiv.org/abs/1905.05489
• Zimmermann R., Weber P., Seidling M., Hommelhoff P.:
  Beam splitting of low-energy guided electrons with a two-sided microwave chip
  In: Applied Physics Letters 115 (2019), Art.Nr.: 104103
  ISSN: 0003-6951
  DOI: 10.1063/1.5117355
  URL: https://aip.scitation.org/doi/abs/10.1063/1.5117355

2018

• Heide C., Higuchi T., Weber HB., Hommelhoff P.:
  Coherent Electron Trajectory Control in Graphene
  In: Physical Review Letters 121 (2018), Art.Nr.: 207401
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.121.207401
  URL: https://arxiv.org/abs/1811.07047
• Kozak M., Eckstein T., Schönenberger N., Hommelhoff P.:
  Inelastic ponderomotive scattering of electrons at a high-intensity optical travelling wave in vacuum
  In: Nature Physics 14 (2018), S. 121–125
  ISSN: 1745-2473
  DOI: 10.1038/nphys4282
  URL: https://arxiv.org/abs/1905.05240
• Kozak M., McNeur J., Schönenberger N., Illmer J., Li A., Tafel A., Yousefi P., Eckstein T., Hommelhoff P.:
  Ultrafast scanning electron microscope applied for studying the interaction between free electrons and optical near-fields of periodic nanostructures
  In: Journal of Applied Physics 124 (2018), Art.Nr.: 023104
  ISSN: 0021-8979
  DOI: 10.1063/1.5032093
  URL: https://arxiv.org/abs/1805.07402
• Kozak M., Schönenberger N., Hommelhoff P.:
  Ponderomotive Generation and Detection of Attosecond Free-Electron Pulse Trains
  In: Physical Review Letters 120 (2018), Art.Nr.: 103203
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.120.103203
  URL: https://arxiv.org/abs/1905.05245
• Krüger M., Lemell C., Wachter G., Burgdörfer J., Hommelhoff P.:
  Attosecond physics phenomena at nanometric tips
  In: Journal of the Physics B: Atomic and Molecular Physics 51 (2018), Art.Nr.: 172001
  ISSN: 0022-3700
  DOI: 10.1088/1361-6455/aac6ac
  URL: http://iopscience.iop.org/article/10.1088/1361-6455/aac6ac
• McNeur J., Kozak M., Schönenberger N., Leedle KJ., Deng H., Ceballos A., Hoogland H., Ruehl A., Hartl I., Holzwarth R., Solgaard O., Harris JS., Byer RL., Hommelhoff P.:
  Elements of a dielectric laser accelerator
  In: Optica 5 (2018), S. 687-690
  ISSN: 2334-2536
  DOI: 10.1364/OPTICA.5.000687
  URL: https://arxiv.org/abs/1604.07684
• Meier S., Higuchi T., Nutz M., Högele A., Hommelhoff P.:
  High spatial coherence in multiphoton-photoemitted electron beams
  In: Applied Physics Letters 113 (2018), Art.Nr.: 143101
  ISSN: 0003-6951
  DOI: 10.1063/1.5045282
  URL: https://arxiv.org/abs/1811.06376
• Niedermayer U., Egenolf T., Boine-Frankenheim O., Hommelhoff P.:
  Alternating-Phase Focusing for Dielectric-Laser Acceleration
  In: Physical Review Letters 121 (2018), Art.Nr.: 214801
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.121.214801
  URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.214801
• Schoetz J., Mitra S., Fuest H., Neuhaus M., Okell WA., Förster M., Paschen T., Ciappina MF., Yanagisawa H., Wnuk P., Hommelhoff P., Kling MF.:
  Nonadiabatic ponderomotive effects in photoemission from nanotips in intense midinfrared laser fields
  In: Physical Review A 97 (2018), Art.Nr.: 013413
  ISSN: 1050-2947
  DOI: 10.1103/PhysRevA.97.013413
  URL: https://arxiv.org/abs/1905.06079
• Seiffert L., Paschen T., Hommelhoff P., Fennel T.:
  High-order above-threshold photoemission from nanotips controlled with two-color laser fields
  In: Journal of the Physics B: Atomic and Molecular Physics 51 (2018), Art.Nr.: 134001
  ISSN: 0022-3700
  DOI: 10.1088/1361-6455/aac34f
  URL: https://arxiv.org/abs/1802.04553
• Yousefi P., McNeur J., Kozak M., Niedermayer U., Gannott F., Lohse O., Boine-Frankenheim O., Hommelhoff P.:
  Silicon dual pillar structure with a distributed Bragg reflector for dielectric laser accelerators: Design and fabrication
  In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2018), S. 221-223
  ISSN: 0168-9002
  DOI: 10.1016/j.nima.2018.01.065
  URL: https://arxiv.org/abs/1801.05234

2017

• Ciappina MF., Perez-Hernandez JA., Landsman A., Okell WA., Zherebtsov S., Förg B., Schoetz J., Seiffert L., Fennel T., Shaaran T., Zimmermann T., Chacón A., Guichard R., Zaïr A., Tisch JWG., Marangos JP., Witting T., Braun A., Maier SA., Roso L., Krüger M., Hommelhoff P., Kling MF., Krausz F., Lewenstein M.:
  Attosecond physics at the nanoscale
  In: Reports on Progress in Physics 80 (2017), Art.Nr.: 054401
  ISSN: 0034-4885
  DOI: 10.1088/1361-6633/aa574e
  URL: https://arxiv.org/abs/1607.01480
• Eduard P., Bettoni S., Calvi M., Dehler M., Frei F., Hommelhoff P., Kozak M., McNeur J., C. Ozkan L., Reiche S., Romann A., Ischebeck R.:
  Outline of a dielectric laser acceleration experiment at SwissFEL
  In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2017), S. 87-90
  ISSN: 0168-9002
  DOI: 10.1016/j.nima.2017.01.016
• Förster M., Paschen T., Thomas S., Krüger M., Hommelhoff P.:
  Strong-Field-Assisted Measurement of Near-Fields and Coherent Control of Photoemission at Nanometric Metal Tips
  In: Progress in Ultrafast Intense Laser Science, Springer, 2017, S. 143-155
  DOI: 10.1007/978-3-319-64840-8_8
  URL: https://link.springer.com/chapter/10.1007/978-3-319-64840-8_8
• Higuchi T., Heide C., Ullmann K., Weber HB., Hommelhoff P.:
  Light-field-driven currents in graphene
  In: Nature 550 (2017), S. 224–228
  ISSN: 0028-0836
  DOI: 10.1038/nature23900
  URL: https://arxiv.org/abs/1607.04198
• Hoff D., Krüger M., Maisenbacher L., Paulus G. G., Hommelhoff P., Sayler A M.:
  Using the focal phase to control attosecond processes
  In: Journal of Optics A-Pure and Applied Optics 19 (2017), Art.Nr.: 124007
  ISSN: 1464-4258
  DOI: 10.1088/2040-8986/aa9247
• Hoff D., Krüger M., Maisenbacher L., Sayler A M., Paulus G. G., Hommelhoff P.:
  Tracing the phase of focused broadband laser pulses
  In: Nature Physics 13 (2017), S. 947–951
  ISSN: 1745-2473
  DOI: 10.1038/nphys4185
  URL: https://arxiv.org/abs/1805.11531
• Hommelhoff P.:
  Coherence in laser-driven electrons at the surface and in the volume of solid matter
  In: Applied Physics B-Lasers and Optics 123 (2017), Art.Nr.: 11
  ISSN: 0946-2171
  DOI: 10.1007/s00340-016-6586-6
• Kozak M., Beck P., Deng H., McNeur J., Schönenberger N., Gaida C., Stutzki F., Gebhardt M., Limpert J., Ruehl A., Hartl I., Solgaard O., Harris JS., Byer RL., Hommelhoff P.:
  Acceleration of sub-relativistic electrons with an evanescent optical wave at a planar interface
  In: Optics Express 25 (2017), S. 19195-19204
  ISSN: 1094-4087
  DOI: 10.1364/OE.25.019195
• Kozak M., Förster M., McNeur J., Schönenberger N., Leedle K., Deng H., Harris J., Byer R., Hommelhoff P.:
  Dielectric laser acceleration of sub-relativistic electrons by few-cycle laser pulses
  In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2017), S. 84-86
  ISSN: 0168-9002
  DOI: 10.1016/j.nima.2016.12.051
• Kozak M., McNeur J., Leedle K., Deng H., Schönenberger N., Ruehl A., Hartl I., Harris J., Byer R., Hommelhoff P.:
  Optical gating and streaking of free electrons with sub-optical cycle precision
  In: Nature Communications 8 (2017), Art.Nr.: 14342
  ISSN: 2041-1723
  DOI: 10.1038/ncomms14342
  URL: https://arxiv.org/abs/1512.04394
• Liu Q., Rupp P., Foerg B., Schoetz J., Süßmann F., Okell WA., Passig J., Tiggesbäumker J., Meiwes-Broer KH., Seiffert L., Fennel T., Rühl E., Förster M., Hommelhoff P., Sergey Z., Kling MF.:
  Photoemission from nanomaterials in strong few-cycle laser fields
  Springer Verlag, 2017
  DOI: 10.1007/978-94-024-0850-8_14
• Paschen T., Förster M., Krüger M., Lemell C., Wachter G., Libisch F., Madlener T., Burgdörfer J., Hommelhoff P.:
  High visibility in two-color above-threshold photoemission from tungsten nanotips in a coherent control scheme
  In: Journal of Modern Optics 64 (2017), S. 1054-1060
  ISSN: 0950-0340
  DOI: 10.1080/09500340.2017.1281453
  URL: https://arxiv.org/abs/1707.03849
• Schoetz J., Foerg B., Förster M., Okell WA., Stockman MI., Krausz F., Hommelhoff P., Kling MF.:
  Reconstruction of Nanoscale Near Fields by Attosecond Streaking
  In: IEEE Journal of Selected Topics in Quantum Electronics 23 (2017), Art.Nr.: 7738457
  ISSN: 1077-260X
  DOI: 10.1109/JSTQE.2016.2625046
• Seiffert L., Henning P., Rupp P., Zherebtsov S., Hommelhoff P., Kling MF., Fennel T.:
  Trapping field assisted backscattering in strong-field photoemission from dielectric nanospheres
  In: Journal of Modern Optics 64 (2017), S. 1096-1103
  ISSN: 0950-0340
  DOI: 10.1080/09500340.2017.1288838
  URL: https://www.tandfonline.com/doi/full/10.1080/09500340.2017.1288838

2016

• Förg B., Schoetz J., Süßmann F., Förster M., Krüger M., Ahn B., Okell WA., Wintersperger K., Zherebtsov S., Guggenmos A., Pervak V., Kessel A., Trushin SA., Azzeer AM., Stockman MI., Kim D., Krausz F., Hommelhoff P., Kling MF.:
  Attosecond nanoscale near-field sampling
  In: Nature Communications 7 (2016), Art.Nr.: 11717
  ISSN: 2041-1723
  DOI: 10.1038/ncomms11717
  URL: https://arxiv.org/abs/1508.05611
• Förster M., Paschen T., Krüger M., Lemell C., Wachter G., Libisch F., Madlener T., Burgdoerfer J., Hommelhoff P.:
  Two-color coherent control of femtosecond above-threshold photoemission from a Tungsten nanotip
  In: Physical Review Letters 117 (2016), Art.Nr.: 217601
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.117.217601
  URL: https://arxiv.org/abs/1603.01516
• Higuchi T., Heide C., Ullmann K., Weber HB., Hommelhoff P.:
  Light-field driven currents in graphene
  In: arXiv 12 (2016)
  ISSN: 2331-8442
  URL: http://arxiv.org/abs/1607.04198
• Hoogland H., McNeur J., Kozak M., Hommelhoff P., Holzwarth R.:
  Compact Ultrashort Pulsed 2.05 mu m All-PM Fiber Laser For Dielectric Laser Acceleration of Non-relativistic Electrons
  Conference on Lasers and Electro-Optics
  In: OSA Technical Digest 2016
  URL: https://www.osapublishing.org/abstract.cfm?uri=CLEO_SI-2016-SF1I.7
• Kozak M., McNeur J., Leedle K., Deng H., Schönenberger N., Ruehl A., Hartl I., Hoogland H., Holzwarth R., Harris J., Byer RL., Hommelhoff P.:
  Transverse and longitudinal characterization of electron beams using interaction with optical near-fields
  In: Optics Letters 41 (2016), S. 3435-3438
  ISSN: 0146-9592
  DOI: 10.1364/OL.41.003435
  URL: https://arxiv.org/abs/1611.09558
• Kruit P., Hobbs RG., Kim CS., Yang Y., Manfrinato VR., Hammer J., Thomas S., Weber P., Klopfer B., Kohstall C., Juffmann T., Kasevich MA., Hommelhoff P., Berggren KK.:
  Designs for a quantum electron microscope
  In: Ultramicroscopy 164 (2016), S. 31-45
  ISSN: 0304-3991
  DOI: 10.1016/j.ultramic.2016.03.004
• McNeur J., Hammer J., Li A., Tafel A., Hommelhoff P., Tafel A., Hammer J.:
  Recent experimental results and future directions of the DLA single grating project
  16th Advanced Accelerator Concepts Workshop, AAC 2014
  DOI: 10.1063/1.4965635
• McNeur J., Kozak M., Ehberger D., Schönenberger N., Tafel A., Li A., Hommelhoff P.:
  A miniaturized electron source based on dielectric laser accelerator operation at higher spatial harmonics and a nanotip photoemitter
  In: Journal of Physics B-Atomic Molecular and Optical Physics 49 (2016)
  ISSN: 0953-4075
  DOI: 10.1088/0953-4075/49/3/034006
• McNeur J., Kozak M., Schönenberger N., Leedle K., Deng H., Ceballos A., Hoogland H., Ruehl A., Hartl I., Holzwarth R., Solgaard O., Harris J., Byer R., Hommelhoff P.:
  Elements of a dielectric laser accelerator
  In: arXiv 4 (2016)
  ISSN: 2331-8442
  URL: http://arxiv.org/abs/1604.07684
• McNeur J., Kozak M., Schönenberger N., Li A., Tafel A., Hommelhoff P.:
  Laser-driven acceleration of subrelativistic electrons near a nanostructured dielectric grating: From acceleration via higher spatial harmonics to necessary elements of a dielectric accelerator
  In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 829 (2016), S. 50-51
  ISSN: 0168-9002
  DOI: 10.1016/j.nima.2016.01.009

2015

• Ehberger D., Hammer J., Eisele M., Krüger M., Noe J., Högele A., Hommelhoff P.:
  Highly Coherent Electron Beam from a Laser-Triggered Tungsten Needle Tip.
  In: Physical Review Letters 114 (2015), S. 227601
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.114.227601
  URL: https://arxiv.org/abs/1412.4584
• Hammer J., Thomas S., Weber P., Hommelhoff P.:
  Microwave chip-based beam splitter for low-energy guided electrons
  In: Physical Review Letters 114 (2015), Art.Nr.: 254801
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.114.254801
• Higuchi T., Maisenbacher L., Liehl A., Dombi P., Hommelhoff P.:
  A nanoscale vacuum-tube diode triggered by few-cycle laser pulses
  In: Applied Physics Letters 106 (2015), S. 051109
  ISSN: 0003-6951
  DOI: 10.1063/1.4907607
  URL: https://arxiv.org/abs/1905.10712
• Hommelhoff P., Higuchi T.:
  Strong-field physics: Harmonic radiation from crystals
  In: Nature 523 (2015), S. 541-542
  ISSN: 0028-0836
  DOI: 10.1038/523541a
• Hommelhoff P., Kling MF. (Hrsg.):
  Attosecond Nanophysics: From Basic Science to Applications
  2015
  DOI: 10.1002/9783527665624
  URL: http://eu.wiley.com/WileyCDA/WileyTitle/productCd-3527411712.html
• Thomas S., Hammer J., Weber P., Hommelhoff P.:
  Can a Quantum Electron Microscope Achieve Low - Damage (Biological) Imaging?
  In: Microscopy and Microanalysis 21 (2015), S. 50-53
  ISSN: 1431-9276
  DOI: 10.1017/S1431927615013124
• Thomas S., Wachter G., Lemell C., Burgdörfer J., Hommelhoff P.:
  Large optical field enhancement for nanotips with large opening angles
  In: New Journal of Physics 17 (2015), Art.Nr.: 063010
  ISSN: 1367-2630
  DOI: 10.1088/1367-2630/17/6/063010
  URL: https://arxiv.org/abs/1412.8172

2014

• Breuer J., Graf R., Apolonski A., Hommelhoff P.:
  Dielectric laser acceleration of nonrelativistic electrons at a single fused silica grating structure: Experimental part
  In: Physical Review Special Topics-Accelerators and Beams 17 (2014), S. 021301
  ISSN: 1098-4402
  DOI: 10.1103/PhysRevSTAB.17.021301
  URL: http://journals.aps.org/prstab/abstract/10.1103/PhysRevSTAB.17.021301
• Breuer J., Hommelhoff P.:
  Dielectric laser acceleration of 28 keV electrons with the inverse Smith-Purcell effect
  In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 740 (2014), S. 114
  ISSN: 0168-9002
  DOI: 10.1016/j.nima.2013.10.078
  URL: http://www.sciencedirect.com/science/article/pii/S016890021301485X
• Breuer J., Hommelhoff P.:
  Direct laser acceleration of 28 keV electrons at a single dielectric grating
  Workshop on Physics and Applications of High Brightness Beams: Towards a 5th Generation Light Source (San Juan)
  DOI: 10.1016/jphpro.2014.06.004
• Breuer J., McNeur J., Hommelhoff P.:
  Dielectric laser acceleration of electrons in the vicinity of single and double grating structures - theory and simulations
  In: Journal of Physics B: Atomic, Molecular and Optical Physics 47 (2014), S. 234004
  ISSN: 1361-6455
  DOI: 10.1088/0953-4075/47/23/234004
  URL: http://iopscience.iop.org/0953-4075/47/23/234004/
• Ciappina MF., Perez-Hernandez JA., Shaaran T., Lewenstein M., Krüger M., Hommelhoff P.:
  High-order harmonic generation driven by metal nanotip photoemission: theory and simulations
  In: Physical Review A 89 (2014), S. 013409
  ISSN: 1050-2947
  DOI: 10.1103/PhysRevA.89.013409
  URL: http://pra.aps.org/abstract/PRA/v89/i1/e013409
• England RJ., Noble RJ., Bane K., Dowell DH., Ng CK., Spencer JE., Tantawi S., Wu Z., Byer RL., Peralta E., Soong K., Chang CM., Montazeri B., Wolf SJ., Cowan B., Dawson J., Gai W., Hommelhoff P., Huang YC., Jing C., Mcguinness C., Palmer RB., Naranjo B., Rosenzweig J., Travish G., Mizrahi A., Schachter L., Sears C., Werner GR., Yoder RB.:
  Dielectric laser accelerators
  In: Reviews of Modern Physics 86 (2014), S. 1337
  ISSN: 0034-6861
  DOI: 10.1103/RevModPhys.86.1337
  URL: http://link.aps.org/doi/10.1103/RevModPhys.86.1337
• Hammer J., Hoffrogge J., Heinrich S., Hommelhoff P.:
  Phase-Resolved Electron Guiding in Optimized Chip-Based Microwave Potentials
  In: Physical Review Applied 2 (2014), S. 044015
  ISSN: 2331-7019
  DOI: 10.1103/PhysRevApplied.2.044015
  URL: http://link.aps.org/doi/10.1103/PhysRevApplied.2.044015
• Higuchi T., Stockman MI., Hommelhoff P.:
  Strong-Field Perspective on High-Harmonic Radiation from Bulk Solids
  In: Physical Review Letters 113 (2014), S. 213901
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.113.213901
  URL: https://arxiv.org/abs/1406.7234
• Hoffrogge J., Stein JP., Krüger M., Förster M., Hammer J., Ehberger D., Baum P., Hommelhoff P.:
  Tip-based source of femtosecond electron pulses at 30 keV
  In: Journal of Applied Physics 115 (2014), S. 094506
  ISSN: 0021-8979
  DOI: 10.1063/1.4867185
• Krüger M., Thomas S., Förster M., Hommelhoff P.:
  Self-probing of metal nanotips by rescattered electrons reveals the nano-optical near-field
  In: Journal of Physics B: Atomic, Molecular and Optical Physics 47 (2014), S. 124022
  ISSN: 1361-6455
  DOI: 10.1088/0953-4075/47/12/124022
• Thomas S., Kohstall C., Kruit P., Hommelhoff P.:
  Semitransparency in interaction-free measurements
  In: Physical Review A - Atomic, Molecular, and Optical Physics 90 (2014), S. 053840
  ISSN: 1094-1622
  DOI: 10.1103/PhysRevA.90.053840
• Vernaleken A., Schmidt B., Haensch TW., Holzwarth R., Hommelhoff P.:
  Carrier-envelope frequency stabilization of a Ti:sapphire oscillator using different pump lasers: part II
  In: Applied Physics B-Lasers and Optics 117 (2014), S. 33
  ISSN: 0946-2171
  DOI: 10.1007/s00340-014-5795-0
  URL: http://link.springer.com/article/10.1007/s00340-014-5795-0

2013

• Breuer J., Hommelhoff P.:
  Laser-based acceleration of nonrelativistic electrons at a dielectric structure
  In: Physical Review Letters 111 (2013), S. 134803
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.111.134803
• Hommelhoff P., Kling MF., Stockman MI.:
  Ultrafast phenomena on the nanoscale
  In: Annalen Der Physik 525 (2013), S. A13-A14
  ISSN: 0003-3804
  DOI: 10.1002/andp.201300709
  URL: http://onlinelibrary.wiley.com/doi/10.1002/andp.201300709/abstract
• Ott C., Schoenwald M., Raith P., Kaldun A., Sansone G., Krüger M., Hommelhoff P., Patil Y., Zhang Y., Meyer K., Laux M., Pfeifer T.:
  Strong-field spectral interferometry using the carrier-envelope phase
  In: New Journal of Physics 15 (2013), Art.Nr.: 073031
  ISSN: 1367-2630
  DOI: 10.1088/1367-2630/15/7/073031
• Thomas S., Krüger M., Breuer J., Förster M., Hommelhoff P.:
  Ultrashort laser oscillator pulses meet nano-structures: from attosecond physics at metal tips to dielectric laser accelerators
  In: Journal of Physics : Conference Series 467 (2013), S. 012004
  ISSN: 1742-6588
  DOI: 10.1088/1742-6596/467/1/012004
  URL: http://iopscience.iop.org/1742-6596/467/1/012004/
• Thomas S., Krüger M., Förster M., Hommelhoff P.:
  Electron rescattering in photoemission from metal tips as a nanoscale probe of near-field enhancement
  The European Conference on Lasers and Electro-Optics, CLEO_Europe 2013 (Munich)
  DOI: 10.1109/CLEOE-IQEC.2013.6801158
• Thomas S., Krüger M., Förster M., Schenk M., Hommelhoff P.:
  Probing of optical near-fields by electron rescattering on the 1nm scale
  In: Nano Letters 13 (2013), S. 4790-4794
  ISSN: 1530-6984
  DOI: 10.1021/nl402407r
• Yalunin SV., Herink G., Solli DR., Krüger M., Hommelhoff P., Diehn M., Munk A., Ropers C.:
  Field localization and rescattering in tip-based photoemission
  In: Annalen Der Physik 525 (2013), S. L12-L18
  ISSN: 0003-3804
  DOI: 10.1002/andp.201200224

2012

• Homann C., Bradler M., Förster M., Hommelhoff P., Riedle E.:
  Carrier-envelope phase stable sub-two-cycle pulses tunable around 1.8um at 100 kHz
  In: Optics Letters 37 (2012), S. 1673
  ISSN: 0146-9592
  DOI: 10.1364/OL.37.001673
• Krueger M., Schenk M., Foerster M., Hommelhoff P.:
  Attosecond physics in photoemission from a metal nanotip
  In: Journal of Physics B-Atomic Molecular and Optical Physics 45 (2012), S. 074006
  ISSN: 0953-4075
  DOI: 10.1088/0953-4075/45/7/074006
  URL: http://stacks.iop.org/0953-4075/45/074006
• Krüger M., Schenk M., Hommelhoff P.:
  Strong-field effects and attosecond control of electrons in photoemission from a nanoscale metal tip
  12th International Conference on Multiphoton Processes, ICOMP 2011 and the 3rd International Conference on Attosecond Physics, ATTO 2011 (Sapporo, Hokkaido)
  DOI: 10.1007/978-3-642-28948-4_66
• Krüger M., Schenk M., Hommelhoff P., Wachter G., Lemell C., Burgdoerfer J.:
  Interaction of ultrashort laser pulses with metal nanotips: a model system for strong-field phenomena
  In: New Journal of Physics 14 (2012), S. 085019
  ISSN: 1367-2630
  DOI: 10.1088/1367-2630/14/8/085019
  URL: http://iopscience.iop.org/1367-2630/14/8/085019
• Thomas S., Holzwarth R., Hommelhoff P.:
  Generating few-cycle pulses for nanoscale photoemission easily with an erbium-doped fiber laser
  In: Optics Express 20 (2012), S. 13663
  ISSN: 1094-4087
  DOI: 10.1364/OE.20.013663
  URL: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-20-13-13663
• Vernaleken A., Schmidt B., Wolferstetter M., Haensch TW., Holzwarth R., Hommelhoff P.:
  Carrier-envelope frequency stabilization of a Ti:sapphire oscillator using different pump lasers
  In: Optics Express 20 (2012), S. 18387
  ISSN: 1094-4087
  DOI: 10.1364/OE.20.018387
  URL: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-20-16-18387
• Wachter G., Lemell C., Burgdoerfer J., Schenk M., Krüger M., Hommelhoff P.:
  Electron rescattering at metal nanotips induced by ultrashort laser pulses
  In: Physical Review B 86 (2012), S. 035402
  ISSN: 1098-0121
  DOI: 10.1103/PhysRevB.86.035402
  URL: http://prb.aps.org/abstract/PRB/v86/i3/e035402

2011

• Eisele M., Krüger M., Schenk M., Ziegler A., Hommelhoff P.:
  Production of sharp gold tips with high surface quality
  In: Review of Scientific Instruments 82 (2011), S. 026101
  ISSN: 0034-6748
  DOI: 10.1063/1.3534078
  URL: http://rsi.aip.org/resource/1/rsinak/v82/i2/p026101_s1
• Hoffrogge J., Froehlich R., Kasevich MA., Hommelhoff P.:
  Microwave guiding of electrons on a chip
  In: Physical Review Letters 106 (2011), S. 193001
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.106.193001
  URL: http://link.aps.org/doi/10.1103/PhysRevLett.106.193001
• Hoffrogge J., Hommelhoff P.:
  Planar microwave structures for electron guiding
  In: New Journal of Physics 13 (2011), S. 095012
  ISSN: 1367-2630
  DOI: 10.1088/1367-2630/13/9/095012
  URL: http://iopscience.iop.org/1367-2630/13/9/095012/
• Krüger M., Schenk M., Hommelhoff P.:
  Attosecond control of electrons emitted from a nanoscale metal tip
  In: Nature 475 (2011), S. 78
  ISSN: 0028-0836
  DOI: 10.1038/nature10196
  URL: http://www.nature.com/nature/journal/v475/n7354/full/nature10196.html
• Krüger M., Schenk M., Hommelhoff P.:
  Attosecond emission dynamics in nonlinear photoemission from metal tips
  European Quantum Electronics Conference, EQEC 2011 (Munich)
  DOI: 10.1109/CLEOE.2011.5943530
• Vernaleken A., Weitenberg J., Sartorius T., Russbueldt P., Schneider W., Stebbings SL., Kling MF., Hommelhoff P., Hoffmann HD., Poprawe R., Krausz F., Hänsch TW., Udem T.:
  Single pass high harmonic generation at 20.8 MHz repetition rate
  In: Optics Letters 36 (2011), S. 3428-3430
  ISSN: 0146-9592
  DOI: 10.1364/OL.36.003428
  URL: http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-36-17-3428

2010

• Ozawa A., Schneider W., Najafi F., Haensch TW., Udem T., Hommelhoff P.:
  A Peltier cooled single pass amplifier for Titanium:Sapphire laser pulses
  In: Laser Physics 20 (2010), S. 967
  ISSN: 1054-660X
  DOI: 10.1134/S1054660X10090057
  URL: http://www.springerlink.com/content/d11273r38850wr21/?p=56b9eb3ff7874f61a25b35d8cccac31a%C2%BF=0
• Ozawa A., Udem T., Zeitner UD., Haensch TW., Hommelhoff P.:
  Modeling and optimization of single-pass laser amplifiers for high-repetition-rate laser pulses
  In: Physical Review A 82 (2010), S. 033815
  ISSN: 1050-2947
  DOI: 10.1103/PhysRevA.82.033815
  URL: http://link.aps.org/doi/10.1103/PhysRevA.82.033815
• Ozawa A., Vernaleken A., Gotlibovych I., Hommelhoff P., Udem T., Haensch TW.:
  XUV frequency combs
  Conference on Nonlinear Optics and Applications IV (Brussels, Belgium, 12. April 2010 - 15. April 2010)
  In: Proceedings of SPIE 2010
  DOI: 10.1117/12.855844
• Schenk M., Krüger M., Hommelhoff P.:
  Strong-Field Above-Threshold Photoemission from Sharp Metal Tips
  In: Physical Review Letters 105 (2010), Art.Nr.: 257601
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.105.257601
  URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.105.257601

2009

• Foreman SM., Kealhofer C., Kasevich MA., Hommelhoff P.:
  Ultrafast laser-induced electron emission from field emission tips
  Ultrafast Phenomena XVI (Berlin, Heidelberg, New York)
  In: Springer (Hrsg.): Ultrafast Phenomena XVI, Berlin, Heidelberg, New York: 2009
  DOI: 10.1007/978-3-540-95946-5_228
• Hommelhoff P., Kealhofer C., Aghajani-Talesh A., Sortais YRP., Foreman SM., Kasevich MA.:
  Extreme localization of electrons in space and time
  In: Ultramicroscopy 109 (2009), S. 423
  ISSN: 0304-3991
  DOI: 10.1016/j.ultramic.2008.10.021
• Hommelhoff P., Kealhofer C., Kasevich MA.:
  Reaching the resolved tunnel regime for a femtosecond oscillator driven field emission electron source
  In: Laser Physics 19 (2009), S. 736-738
  ISSN: 1054-660X
  DOI: 10.1134/S1054660X09040288
  URL: http://www.springerlink.com/content/061x28k551182151/?p=b869c3c1934340b9be662ddb525480dd%C2%BF=27
• Ozawa A., Schneider W., Haensch TW., Udem T., Hommelhoff P.:
  Phase-stable single-pass cryogenic amplifier for high repetition rate few-cycle laser pulses
  In: New Journal of Physics 11 (2009), S. 083029
  ISSN: 1367-2630
  DOI: 10.1088/1367-2630/11/8/083029
  URL: http://stacks.iop.org/1367-2630/11/083029
• Plettner T., Byer RL., Mcguinness C., Hommelhoff P.:
  Photonic-based laser driven electron beam deflection and focusing structures
  In: Physical Review Special Topics-Accelerators and Beams 12 (2009), S. 101302
  ISSN: 1098-4402
  DOI: 10.1103/PhysRevSTAB.12.101302
  URL: http://prst-ab.aps.org/abstract/PRSTAB/v12/i10/e101302

2007

• Hommelhoff P., Kealhofer C., Kasevich MA.:
  A spatially and temporally localized sub-laser cycle electron source
  In: Ultrafast Phenomena XV, Berlin, Heidelberg, New York: 2007
  DOI: 10.1007/978-3-540-68781-8-238
• Treutlein P., Steinmetz T., Colombe Y., Lev B., Hommelhoff P., Reichel J., Greiner M., Mandel O., Widera A., Rom T., Bloch I., Haensch TW.:
  Quantum Information Processing in Optical Lattices and Magnetic Microtraps
  In: Elements of Quantum Information, Weinheim, Germany: 2007
  DOI: 10.1002/9783527611065.ch5

2006

• Hommelhoff P., Kealhofer C., Kasevich MA.:
  Femtosecond laser meets field emission tip - a sensor for the carrier envelope phase?
  2006 IEEE International Frequency Control Symposium (Miami, FL, USA)
  In: Proceedings of the 2006 IEEE International Frequency Control Symposium and Expositions 2006
• Hommelhoff P., Kealhofer C., Kasevich MA.:
  Ultrafast electron pulses from a tungsten tip triggered by low power femtosecond laser pulses
  In: Physical Review Letters 97 (2006), S. 247402
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.97.247402
  URL: http://link.aps.org/abstract/PRL/v97/e247402
• Hommelhoff P., Sortais YRP., Aghajani-Talesh A., Kasevich MA.:
  Field Emission Tip as a Nanometer Source of Free Electron Femtosecond Pulses
  In: Physical Review Letters 96 (2006), S. 077401
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.96.077401
  URL: http://link.aps.org/abstract/PRL/v96/e077401
• Treutlein P., Steinmetz T., Colombe Y., Lev B., Hommelhoff P., Reichel J., Greiner M., Mandel O., Widera A., Rom T., Bloch I., Haensch TW.:
  Quantum information processing in optical lattices and magnetic microtraps
  In: Fortschritte Der Physik-Progress of Physics 54 (2006), S. 702-718
  ISSN: 0015-8208
  DOI: 10.1002/prop.200610325
  URL: http://www3.interscience.wiley.com/cgi-bin/abstract/112736872/ABSTRACT

2005

• Hommelhoff P., Hänsel W., Steinmetz T., Hänsch T., Reichel J.:
  Transporting, splitting and merging of atomic ensembles in a chip trap
  In: New Journal of Physics 7 (2005), S. 3
  ISSN: 1367-2630
  DOI: 10.1088/1367-2630/7/1/003
  URL: http://www.iop.org/EJ/abstract/1367-2630/7/1/003

2004

• Treutlein P., Hommelhoff P., Steinmetz T., Hänsch T., Reichel J.:
  Coherence in microchip traps
  In: Physical Review Letters 92 (2004), S. 203005
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.92.203005
  URL: http://prl.aps.org/abstract/PRL/v92/i20/e203005

2003

• Long R., Steinmetz T., Hommelhoff P., Hänsel W., Hänsch T., Reichel J.:
  Magnetic microchip traps and single-atom detection
  In: Philosophical Transactions of the Royal Society A-Mathematical Physical and Engineering Sciences 361 (2003), S. 1375-1389
  ISSN: 1364-503X
  DOI: 10.1098/rsta.2003.1207
  URL: http://www.journals.royalsoc.ac.uk/%28bc5scd4505gsyhraqfte2ozk%29/app/home/contribution.asp?referrer=parent&backto=issue,6,21;journal,43,147;linkingpublicationresults,1:102021,1%22
• Treutlein P., Hommelhoff P., Haensch TW., Reichel J.:
  Coherent atomic states in microtraps
  In: Proceedings of the XVI International Conference on Laser Spectroscopy, Singapore: 2003

2002

• Treutlein P., Hommelhoff P., Long R., Rom T., Steinmetz T., Hänsch T.:
  Speedy BEC in a tiny trap: coherent matter waves on a microchip
  In: Proceedings of the XV International Conference on Laser Spectroscopy, Singapore: 2002

2001

• Hänsel W., Hommelhoff P., Hänsch T., Reichel J.:
  Bose–Einstein condensation on a microelectronic chip
  In: Nature 413 (2001), S. 498-501
  ISSN: 0028-0836
  DOI: 10.1038/35097032
  URL: http://www.nature.com/nature/journal/v413/n6855/abs/413498a0.html
• Hänsel W., Reichel J., Hommelhoff P., Haensch TW.:
  Magnetic Conveyor Belt for Transporting and Merging Trapped Atom Clouds
  In: Physical Review Letters 86 (2001), S. 608-611
  ISSN: 0031-9007
  DOI: 10.1103/PhysRevLett.86.608
• Hänsel W., Reichel J., Hommelhoff P., Haensch TW.:
  Trapped-atom interferometer in a magnetic microtrap
  In: Physical Review A 64 (2001), S. 063607
  ISSN: 1050-2947
  URL: http://prola.aps.org/abstract/PRA/v64/i6/e063607
• Reichel J., Hänsel W., Hommelhoff P., Hänsch T.:
  Applications of integrated magnetic microtraps
  In: Applied Physics B-Lasers and Optics 72 (2001), S. 81-89
  ISSN: 0946-2171
  URL: http://www.springerlink.com/content/y86xd6kjxf12wujw/?p=a591636657bf4c0789fda3a4996efaf3&pi=10