期刊
ULTRAMICROSCOPY
卷 176, 期 -, 页码 63-73出版社
ELSEVIER
DOI: 10.1016/j.ultramic.2016.12.005
关键词
Ultrafast transmission electron microscopy; (UTEM); Nanoscale photoemitters; Nanoscale structural dynamics; Ultrafast dynamics; Coherent ultrashort electron pulses
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [DFG-SFB 1073]
- Quantum Dynamics in Tailored Intense Fields [DFG-SPP 1840]
- Lower Saxony Ministry of Science and Culture
We present the development of the first ultrafast transmission electron microscope (UTEM) driven by localized photoemission from a field emitter cathode. We describe the implementation of the instrument, the photoemitter concept and the quantitative electron beam parameters achieved. Establishing a new source for ultrafast TEM, the Gottingen UTEM employs nano-localized linear photoemission from a Schottky emitter, which enables operation with freely tunable temporal structure, from continuous wave to femtosecond pulsed mode. Using this emission mechanism, we achieve record pulse properties in ultrafast electron microscopy of 9 angstrom focused beam diameter, 200 fs pulse duration and 0.6 eV energy width. We illustrate the possibility to conduct ultrafast imaging, diffraction, holography and spectroscopy with this instrument and also discuss opportunities to harness quantum coherent interactions between intense laser fields and free-electron beams.
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