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

被引：10
作者：
Ehberger, Dominik [1 ,2 ]
Kealhofer, Catherine [1 ,2 ,3 ]
Baum, Peter [1 ,2 ,4 ]
机构：
[1] Ludwig Maximilians Univ Munchen, Coulombwall 1, D-85748 Garching, Germany
[2] Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, Germany
[3] Williams Coll, Dept Phys, Williamstown, MA 01267 USA
[4] Univ Konstanz, Fachbereich Phys, Univ Str 10, D-78467 Constance, Germany
来源：
STRUCTURAL DYNAMICS-US | 2018年 / 5卷 / 04期
基金：
欧洲研究理事会;
关键词：
PULSES; ATTOSECOND; MICROSCOPY; DYNAMICS; RESOLUTION; MODES;
D O I：
10.1063/1.5045167
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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. (C) 2018 Author(s).
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页数：9
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