@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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    <dcterms:abstract xml:lang="eng">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 &lt;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 &lt;10 meV resolution, independent of the source's initial energy spread and limited only by the achievable THz field strength and measuring time.</dcterms:abstract>
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