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Real-time dynamics of clusters. II. I2Xn (n=1; X=He, Ne, and H2), picosecond fragmentation

Gutmann, M. and Willberg, D. M. and Zewail, A. H. (1992) Real-time dynamics of clusters. II. I2Xn (n=1; X=He, Ne, and H2), picosecond fragmentation. Journal of Chemical Physics, 97 (11). pp. 8037-8047. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:GUTjcp92a

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Abstract

In this second paper (II) of a series, we report our picosecond time-resolved studies of the state-to-state rates of vibrational predissociation in iodine–rare gas (van der Waals) clusters. Particular focus is on the simplest system, I2He, which serves as a benchmark for theoretical modeling. Comparisons with I2Ne and I2H2 are also presented. The results from measurements made in real time are compared with those deduced from linewidth measurements, representing a rare example of a system studied by both methods under identical conditions and excited to the same quantum (v<sup>[script ']</sup><sub>i</sub>) states. The discrepancies are discussed in relation to the origin of the broadening and preparation of the state. The rates as a function of v<sup>[script ']</sup><sub>i</sub> display a nonlinear behavior which is examined in relation to the energy-gap law. The measured absolute rates and their dependence on v<sup>[script ']</sup><sub>i</sub> are compared with numerous calculations invoking classical, quantum, and semiclassical theories. In the following paper (III in this series), the cluster size of the same system, I2Xn, is increased (n=2–4) and the dynamics are studied.


Item Type:Article
Additional Information:Copyright © 1992 American Institute of Physics (Received 1 July 1992; accepted 25 August 1992) This work was supported by a grant from the National Science Foundation (DMR). [M.G. was a] Deutsche Forschungsgemeinschaft post-doctoral fellow from Germany. Arthur Amos Noyes Laboratory of Chemical Physics, Contribution number 8638.
Subject Keywords:PS RANGE; MOLECULAR CLUSTERS; IODINE COMPLEXES; HELIUM COMPLEXES; NEON COMPLEXES; HYDROGEN COMPLEXES; TIME RESOLUTION; VIBRATIONAL STATES; PREDISSOCIATION; VAN DER WAALS FORCES; NONLINEAR PROBLEMS; SIZE; RARE GASES
Record Number:CaltechAUTHORS:GUTjcp92a
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:GUTjcp92a
Alternative URL:http://dx.doi.org/10.1063/1.463426
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5411
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:16 Oct 2006
Last Modified:26 Dec 2012 09:05

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