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Science 19 January 2001:
Vol. 291. no. 5503, pp. 458 - 462
DOI: 10.1126/science.291.5503.458
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Reports
Direct Imaging of Transient Molecular Structures with Ultrafast Diffraction
Hyotcherl Ihee,
Vladimir A. Lobastov,
Udo M. Gomez,
Boyd M. Goodson,
Ramesh Srinivasan,
Chong-Yu Ruan,
Ahmed H. Zewail*
Ultrafast electron diffraction (UED) has been developed to study
transient structures in complex chemical reactions initiated with
femtosecond laser pulses. This direct imaging of reactions was achieved
using our third-generation apparatus equipped with an electron pulse
(1.07 ± 0.27 picoseconds) source, a charge-coupled device camera,
and a mass spectrometer. Two prototypical gas-phase reactions were
studied: the nonconcerted elimination reaction of a haloethane, wherein
the structure of the intermediate was determined, and the ring opening
of a cyclic hydrocarbon containing no heavy atoms. These results
demonstrate the vastly improved sensitivity, resolution, and
versatility of UED for studying ultrafast structural dynamics in
complex molecular systems.
Laboratory for Molecular Sciences, Arthur Amos Noyes Laboratory of
Chemical Physics, California Institute of Technology, Pasadena, CA
91125, USA.
*
To whom correspondence should be addressed.
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