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Title: High current table-top setup for femtosecond gas electron diffraction

Journal Article · · Structural Dynamics
DOI:https://doi.org/10.1063/1.4983225· OSTI ID:1374554
 [1];  [1];  [1];  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy

Here, we have constructed an experimental setup for gas phase electron diffraction with femtosecond resolution and a high average beam current. While gas electron diffraction has been successful at determining molecular structures, it has been a challenge to reach femtosecond resolution while maintaining sufficient beam current to retrieve structures with high spatial resolution. The main challenges are the Coulomb force that leads to broadening of the electron pulses and the temporal blurring that results from the velocity mismatch between the laser and electron pulses as they traverse the sample. We also present here a device that uses pulse compression to overcome the Coulomb broadening and deliver femtosecond electron pulses on a gas target. The velocity mismatch can be compensated using laser pulses with a tilted intensity front to excite the sample. The temporal resolution of the setup was determined with a streak camera to be better than 400 fs for pulses with up to half a million electrons and a kinetic energy of 90 keV. Finally, the high charge per pulse, combined with a repetition rate of 5 kHz, results in an average beam current that is between one and two orders of magnitude higher than previously demonstrated.

Research Organization:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0014170
OSTI ID:
1374554
Journal Information:
Structural Dynamics, Vol. 4, Issue 4; ISSN 2329-7778
Publisher:
American Crystallographic Association/AIPCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (7)

Solving the jitter problem in microwave compressed ultrafast electron diffraction instruments: Robust sub-50 fs cavity-laser phase stabilization journal September 2017
Theoretical study of ultrafast x-ray photoelectron diffraction from molecules undergoing photodissociation journal March 2018
Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction journal September 2019
Attomicroscopy: from femtosecond to attosecond electron microscopy journal January 2018
Time-resolved photoelectron angular distributions from nonadiabatically aligned CO 2 molecules with SX-FEL at SACLA journal November 2018
Solving the Jitter Problem in Microwave Compressed Ultrafast Electron Diffraction Instruments: Robust Sub-50 fs Cavity-Laser Phase Stabilization text January 2017
Attomicroscopy: from Femtosecond to Attosecond Electron Microscopy text January 2018

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