
Proceedings Paper
Femtosecond electron pulse generation and measurement for diffractive imaging of isolated moleculesFormat | Member Price | Non-Member Price |
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Paper Abstract
We have constructed an electron gun that delivers highly charged femtosecond electron pulses to a target with kHz
repetition rate. Electron pulses are generated by femtosecond laser pulses in a photoemission process and are accelerated
up to 100 kV and compressed to sub-picosecond duration. Compression is essential to compensate for the space charge
effect that increases the size of electron pulses in all directions significantly. The pulses are compressed transversely by
magnetic lenses and longitudinally by the longitudinal electric field of a radio-frequency cavity. The longitudinal
compression is achieved by decelerating the electrons in the leading edge of the pulse, and accelerating the electrons in
the trailing edge of the pulse. This results in the pulse compressing and reaching the minimum pulse duration at a known
distance from the compression cavity. The short pulse duration and high repetition rate will be essential to observe subpicosecond
dynamic processes in molecules in gas phase with a good signal to noise ratio. A streak camera, consisting of
a millimeter-sized parallel plate capacitor, was used to measure the pulse duration in situ.
Paper Details
Date Published: 26 September 2016
PDF: 10 pages
Proc. SPIE 9956, Ultrafast Nonlinear Imaging and Spectroscopy IV, 995602 (26 September 2016); doi: 10.1117/12.2237381
Published in SPIE Proceedings Vol. 9956:
Ultrafast Nonlinear Imaging and Spectroscopy IV
Zhiwen Liu, Editor(s)
PDF: 10 pages
Proc. SPIE 9956, Ultrafast Nonlinear Imaging and Spectroscopy IV, 995602 (26 September 2016); doi: 10.1117/12.2237381
Show Author Affiliations
Omid Zandi, Univ. of Nebraska-Lincoln (United States)
Kyle J. Wilkin, Univ. of Nebraska-Lincoln (United States)
Alice J. DeSimone, Univ. of Nebraska-Lincoln (United States)
Kyle J. Wilkin, Univ. of Nebraska-Lincoln (United States)
Alice J. DeSimone, Univ. of Nebraska-Lincoln (United States)
Jie Yang, Univ. of Nebraska-Lincoln (United States)
Martin Centurion, Univ. of Nebraska-Lincoln (United States)
Martin Centurion, Univ. of Nebraska-Lincoln (United States)
Published in SPIE Proceedings Vol. 9956:
Ultrafast Nonlinear Imaging and Spectroscopy IV
Zhiwen Liu, Editor(s)
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