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Femtosecond real-time probing of reactions. 13. Multiphoton dynamics of mercury iodide (IHgI)

Pedersen, S. and Baumert, T. and Zewail, A. H. (1993) Femtosecond real-time probing of reactions. 13. Multiphoton dynamics of mercury iodide (IHgI). Journal of Physical Chemistry, 97 (48). pp. 12460-12465. ISSN 0022-3654.

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Real-time studies of the dynamics were performed on the reaction of HgI_2 in a molecular beam. Excitation was by either one or multi pump photons (311 nm), leading to two separate sets of dynamics, each of which could be investigated by a time-delayed probe laser (622 nm) that ionized the parent molecule and the fragments by REMPI processes. These dynamics were distinguished by combining the information from transients taken at each mass (HgI_2, HgI, Hgl, I_2, and I) with the results of pump (and probe) power dependence studies on each mass. A method of plotting the slope of the intensity dependence against the pump-probe time delay proved essential. In the preceding publication, we detailed the dynamics of the reaction initiated by a one photon excitation to the A-continuum. Here, we present studies of higher-energy states. Multiphoton excitation accesses predissociative states of HgI_2, for which there are crossings into the symmetric and asymmetric stretch coordinates. The dynamics of these channels, which lead to atomic (I or Hg) and diatomic (Hgl) fragments, are discussed and related to the nature of the intermediates along the reaction pathway.

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Additional Information:© 1993 American Chemical Society. Abstract published in Advance ACS Abstracts, November 1, 1993. This work was supported by a grant from the Air Force Office of Scientific Research and the National Science Foundation. Contribution No. 8848.
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Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
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Arthur Amos Noyes Laboratory of Chemical Physics8848
Issue or Number:48
Record Number:CaltechAUTHORS:20160826-104207542
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Official Citation:Femtosecond real-time probing of reactions. 13. Multiphoton dynamics of mercury iodide (IHgI) S. Pedersen, T. Baumert, and A. H. Zewail The Journal of Physical Chemistry 1993 97 (48), 12460-12465 DOI: 10.1021/j100150a003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69963
Deposited By: Ruth Sustaita
Deposited On:29 Aug 2016 23:33
Last Modified:03 Oct 2019 10:26

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