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Proceedings Paper

VUV photodissociation dynamics of OClO: binary and triple dissociation
Author(s): Dennis W. Hwang; Jim J. Lin; Yuan T. Lee; Xueming Yang
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Paper Abstract

Photodissociation of OClO at 157.6 nm excitation has been investigated using the photofragment transnational spectroscopic technique. Two distinctive chemical dissociation channels have been observed: one is the binary dissociation process, OClO + hv yields ClO + O; the other one is the triple dissociation process, OClO + hv yields Cl + O + O. The branching ratio of the binary dissociation channel to the triple dissociation channel is determined to be 0.59: 0.41. Bimodal vibrational distribution of the ClO product has been observed for the OClO yields ClO (X2 (Pi) ) + O(3P, 1D) channel, implying that two distinctive dissociation routes possibly exist in the binary dissociation process. The bimodal distribution is likely caused by the two dissociation pathways from two excited electronic states: the D(2A1) and E(2B1) states of OClO. These arguments are further supported by the results of the anisotropy parameter measurements for the binary dissociation channels. Experimental results also show that the OClO + hv yields ClO(X2 (Pi) ) + O(1S) and OClO + hv yields ClO(A 2(Pi) ) + O(3P) channels might also exist in addition to the ClO(X2(Pi) ) + O(3P, 1D) channel. In the triple dissociation process, experimental results show that the main product channel is the OClO + hv yields Cl(2P) + O(1D) + O(3P) channel, while the OClO + hv yields Cl(2P) + O(3P) + O(3P) channel is the minor one. The branching ratio of these two channels is determined to be 0.89:0.11. From the modeling of the time of flight spectra of the O atom product, it is believed that the triple dissociation process of OClO is a simultaneous process within the time scale of one rotation period.

Paper Details

Date Published: 15 May 1998
PDF: 11 pages
Proc. SPIE 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV, (15 May 1998); doi: 10.1117/12.308413
Show Author Affiliations
Dennis W. Hwang, National Taiwan Univ. (China)
Jim J. Lin, National Taiwan Univ. (China)
Yuan T. Lee, National Univ. of Taiwan and Institute of Atomic and Molecular Sciences (Taiwan)
Xueming Yang, Institute of Atomic and Molecular Sciences (Taiwan)

Published in SPIE Proceedings Vol. 3271:
Laser Techniques for State-Selected and State-to-State Chemistry IV
John W. Hepburn; Robert E. Continetti; Mark A. Johnson, Editor(s)

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