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Energy offset between femtosecond and thermal electrons in nanometer field-emitter tips

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2025

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http://nbn-resolving.de/urn:nbn:de:bsz:352-2-as1r8197fhia4
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https://doi.org/10.1103/y8mq-nhx2
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Deutsche Forschungsgemeinschaft (DFG): SFB 1432

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Physical Review Applied. American Physical Society (APS). 2025, 24, 024021. eISSN 2331-7019. Verfügbar unter: doi: 10.1103/y8mq-nhx2

Zusammenfassung

We investigate the ultrafast photoelectric effect at sharp tungsten needles and find a considerable energy offset between thermally emitted and photoemitted electrons. Neither changes in temperature nor tuning the work function by the Schottky effect strongly affect the free-space energy of the photoelectrons. We explain these discoveries by a direct optical excitation within the band structure of tungsten, followed by scatter-free transport to the surface and emission into free space. Experiments at different photon energies support that the material and not the photon energy determines the primary properties of the electron beam.

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530 Physik

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ISO 690KAZENWADEL, Daniel, Jacob HOLDER, Joel KUTTRUFF, Peter BAUM, 2025. Energy offset between femtosecond and thermal electrons in nanometer field-emitter tips. In: Physical Review Applied. American Physical Society (APS). 2025, 24, 024021. eISSN 2331-7019. Verfügbar unter: doi: 10.1103/y8mq-nhx2
BibTex
@article{Kazenwadel2025-07-15Energ-74268,
  title={Energy offset between femtosecond and thermal electrons in nanometer field-emitter tips},
  year={2025},
  doi={10.1103/y8mq-nhx2},
  volume={24},
  journal={Physical Review Applied},
  author={Kazenwadel, Daniel and Holder, Jacob and Kuttruff, Joel and Baum, Peter},
  note={Article Number: 024021}
}
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