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Femtosecond diffraction with chirped electron pulses

Baum, Peter and Zewail, Ahmed (2008) Femtosecond diffraction with chirped electron pulses. Chemical Physics Letters, 462 (1-3). pp. 14-17. ISSN 0009-2614. doi:10.1016/j.cplett.2008.07.072.

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Here, we report on the possible achievement, in ultrafast electron diffraction and imaging, of temporal resolution of tens of femtoseconds through the use of chirped electron packets in combination with energy filtering. Space–charge forces in multi-electron packets accelerate leading electrons and retard trailing ones, thus inducing correlations of momentum and time. By resolving the diffraction images with an energy analyzer, well-defined temporal slices of the long electron packet can be selected. Numerical simulations show that conventional electron sources are sufficient to reach the 30-fs domain of resolution without electron packet compression. They also reveal the influence of packet shape, electron density and photoemission bandwidth on the achievable time resolution.

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Additional Information:© 2008 Elsevier B.V. Received 13 June 2008; accepted 15 July 2008. Available online 24 July 2008. This work was supported by the National Science Foundation and AFOSR in the Moore Center for Ultrafast Science and Technology at Caltech. We wish to thank Sang Tae Park for his helpful suggestions and the two reviewers for useful comments. Peter Baum acknowledges support, at present, from Professors E. Riedle and W. Zinth.
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Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:1-3
Record Number:CaltechAUTHORS:BAUcpl08
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Official Citation:Peter Baum, Ahmed Zewail, Femtosecond diffraction with chirped electron pulses, Chemical Physics Letters, Volume 462, Issues 1–3, 1 September 2008, Pages 14-17, ISSN 0009-2614, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11703
Deposited By: Archive Administrator
Deposited On:20 Sep 2008 03:05
Last Modified:08 Nov 2021 22:01

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