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Femtosecond Real-Time Probing of Reactions. 17. Centrifugal Effects in Direct Dissociation Reactions

Roberts, Gareth and Zewail, Ahmed H. (1995) Femtosecond Real-Time Probing of Reactions. 17. Centrifugal Effects in Direct Dissociation Reactions. Journal of Physical Chemistry, 99 (9). pp. 2520-2529. ISSN 0022-3654. doi:10.1021/j100009a009.

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The influence of centrifugal repulsion on the real-time photofragmentation dynamics of (quasi)diatomic molecules is investigated. A previously presented classical model (Bersohn, R.; Zewail, A. H. Ber. Bunsenges. Phys. Chem. 1988, 92, 373) for direct dissociation in one (translatory) dimension is invoked to mimic the transient behavior that can be monitored experimentally by femtosecond transition-state spectroscopy. The time-dependent absorption of the probing laser pulse is calculated at transition-state and final product configurations for dissociation with varying amounts of relative rotational angular momentum between separating fragments. In this way, the centrifugal contribution to the potential governing fragmentation is examined in terms of its effect on the characteristic dissociation times for product separation and the lifetimes of transition-state intermediates. Application is made to the photodissociation of ICN via the A continuum, for which it is shown that centrifugal repulsion is not the principal cause of the observed product rotation.

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Additional Information:© 1995 American Chemical Society. Received: September 30, 1994; In Final Form: November 29, 1994. Abstract published in Advance ACS Abstracts, February 1, 1995. Financial support of this work by the National Science Foundation and Air Force Office of Scientific Research is gratefully acknowledged. G.R. thanks SERC for the award of a NATO Postdoctoral Fellowship, during the tenure of which this work was carried out.
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Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Science and Engineering Research Council (SERC)UNSPECIFIED
North Atlantic Treaty Organization (NATO)UNSPECIFIED
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Arthur Amos Noyes Laboratory of Chemical Physics8994
Issue or Number:9
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Official Citation:Femtosecond Real-Time Probing of Reactions. 17. Centrifugal Effects in Direct Dissociation Reactions Gareth Roberts and Ahmed H. Zewail The Journal of Physical Chemistry 1995 99 (9), 2520-2529 DOI: 10.1021/j100009a009
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69936
Deposited By: Ruth Sustaita
Deposited On:26 Aug 2016 15:34
Last Modified:11 Nov 2021 04:22

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