Electron energy analysis by phase-space shaping with THz field cycles

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2018
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Ehberger, Dominik
Kealhofer, Catherine
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Direct Visualization of Light-Driven Atomic-Scale Carrier Dynamics in Space and Time DIVI
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Structural dynamics. 2018, 5(4), 044303. ISSN 2329-7778. eISSN 2329-7778. Available under: doi: 10.1063/1.5045167
Zusammenfassung

Time-resolved electron energy analysis and loss spectroscopy can reveal a wealth of information about material properties and dynamical light-matter interactions. Here, we report an all-optical concept for measuring energy spectra of femtosecond electron pulses with sub-eV resolution. Laser-generated terahertz radiation is used to measure arrival time differences within electron pulses with few-femtosecond precision. Controlled dispersion and subsequent compression of the electron pulses provide almost any desired compromise of energy resolution, signal strength, and time resolution. A proof-of-concept experiment on aluminum reveals an energy resolution of <3.5 eV (rms) at 70-keV after a drift distance of only 0.5 m. Simulations of a two-stage scheme reveal that pre-stretched pulses can be used to achieve <10 meV resolution, independent of the source's initial energy spread and limited only by the achievable THz field strength and measuring time.

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ISO 690EHBERGER, Dominik, Catherine KEALHOFER, Peter BAUM, 2018. Electron energy analysis by phase-space shaping with THz field cycles. In: Structural dynamics. 2018, 5(4), 044303. ISSN 2329-7778. eISSN 2329-7778. Available under: doi: 10.1063/1.5045167
BibTex
@article{Ehberger2018-07Elect-43318,
  year={2018},
  doi={10.1063/1.5045167},
  title={Electron energy analysis by phase-space shaping with THz field cycles},
  number={4},
  volume={5},
  issn={2329-7778},
  journal={Structural dynamics},
  author={Ehberger, Dominik and Kealhofer, Catherine and Baum, Peter},
  note={Article Number: 044303}
}
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