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Ultrafast Electron Diffraction. 4. Molecular Structures and Coherent Dynamics

Williamson, J. Charles and Zewail, Ahmed H. (1994) Ultrafast Electron Diffraction. 4. Molecular Structures and Coherent Dynamics. Journal of Physical Chemistry, 98 (11). pp. 2766-2781. ISSN 0022-3654.

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Ultrafast electron diffraction (UED) is developed, in this and the accompanying paper, as a method for studying gas-phase molecular structure and dynamics on the picosecond (ps) to femtosecond (fs) time scale. Building on our earlier reports (henceforth referred to as 1-3), we discuss theoretical and experimental considerations for the approach. Specifically we show that the use of rotational and vibrational coherences can add a new dimension to structural determination of gas-phase species. In addition to the internuclear separations of the molecular sample, the spatial alignment reflected in the scattering pattern contains bond angles and rotational constants for both excited-state and ground-state species. Vibrational coherence effects are also observable, and the motion of the wave packet is revealed by the change of the diffraction pattern with time, thus yielding the molecular dynamics. UED provides the temporal evolution of the reaction coordinate directly and is well-suited for studies of global structure changes on this time scale. Paper 5 details our experimental studies with UED and the current time resolution of the apparatus.

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Additional Information:© 1994 American Chemical Society. Received: January 13, 1994. This work was supported by a grant from the US. Air Force Office of Scientific Research and the National Science Foundation. The authors thank Dr. Scott Kim and Dr. Marcos Dantus for their stimulating discussions on ultrafast electron diffraction, and Hakno Lee and Dr. Juen-Kai Wang for their help. We thank Dr. Ralf Friichtenicht for assisting in the translation of some of the referenced (German) articles. J.C.W. acknowledges the National Science Foundation for providing a Graduate Student Fellowship.
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Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
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Arthur Amos Noyes Laboratory of Chemical Physics8916
Issue or Number:11
Record Number:CaltechAUTHORS:20160825-105756515
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Official Citation:Ultrafast Electron Diffraction. 4. Molecular Structures and Coherent Dynamics J. Charles Williamson and Ahmed H. Zewail The Journal of Physical Chemistry 1994 98 (11), 2766-2781 DOI: 10.1021/j100062a010
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69943
Deposited By: Ruth Sustaita
Deposited On:26 Aug 2016 15:56
Last Modified:03 Oct 2019 10:26

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