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Femtosecond real-time probing of reactions. V. The reaction of IHgI

Dantus, M. and Bowman, R. M. and Gruebele, M. and Zewail, A. H. (1989) Femtosecond real-time probing of reactions. V. The reaction of IHgI. Journal of Chemical Physics, 91 (12). pp. 7437-7450. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:DANjcp89

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Abstract

The dissociation reaction of HgI2 is examined experimentally using femtosecond transition-state spectroscopy (FTS). The reaction involves symmetric and antisymmetric coordinates and the transition-state is well-defined: IHgI*-->[IHgI]<sup>[double-dagger]@B|</sup><sub>Q[sub S[script ']]Q[sub a[script ']]q</sub>-->HgI+I. FTS is developed for this class of ABA-type reactions and recurrences are observed for the vibrating fragments (symmetric coordinate) along the reaction coordinate (antisymmetric coordinate). The translational motion is also observed as a "delay time" of the free fragments. Analysis of our FTS results indicates that the reaction wave packet proceeds through two pathways, yielding either I(2P3/2) or I*(2P1/2) as one of the final products. Dissociation into these two pathways leads to HgI fragments with different vibrational energy, resulting in distinct trajectories. Hence, oscillatory behaviors of different periods in the FTS transients are observed depending on the channel probed (~300 fs to ~1 ps). These results are analyzed using the standard FTS description, and by classical trajectory calculations performed on model potentials which include the two degrees of freedom of the reaction. Quantum calculations of the expected fluorescence of the fragment are also performed and are in excellent agreement with experiments.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.457267DOIUNSPECIFIED
http://link.aip.org/link/?JCPSA6/91/7437/1PublisherUNSPECIFIED
Additional Information:Copyright © 1989 American Institute of Physics. Received 30 June 1989; accepted 15 August 1989. This work was supported by a grant from the Air Force Office of Scientific Research. Arthur Amos Noyes Laboratory of Chemical Physics, Contribution No. 7971.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific ResearchUNSPECIFIED
Subject Keywords:DISSOCIATION, MERCURY IODIDES, REAL TIME SYSTEMS, FS RANGE, MOLECULAR FRAGMENTS, SPECTROSCOPY, VIBRATIONAL STATES, REACTION INTERMEDIATES
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Other Numbering System NameOther Numbering System ID
Arthur Amos Noyes Laboratory of Chemical Physics7971
Record Number:CaltechAUTHORS:DANjcp89
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:DANjcp89
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11243
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:27 Jul 2008 07:05
Last Modified:26 Dec 2012 10:11

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