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Issue 13, 2009

Multiphoton dissociation dynamics of CH3Br

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Abstract

The state-resolved photodissociation dynamics of CH3Br+ cations are studied using a combination of slice imaging and velocity mapping. Parent ions are prepared by (2 + 1) two-photon resonant three-photon ionization of CH3Br through the 5s Rydberg state in the energy region 29 069.8–29 976.0 cm−1. Analysis of the photoelectron spectra reveals that CH3Br+ ions are produced in the spin–orbit ground electronic state with a wide distribution of vibrational excitation. The photodissociation of CH3Br+ produces CH3+(X) + Br(2P1/2)/Br(2P3/2) whose product state distribution shows substantial excitation in the umbrella mode of the CH3+ photofragment, especially when concurrently producing the Br(2P1/2) channel. The shapes of the photofragment angular distributions clearly show the different dissociation mechanisms in the Br(2P1/2) and Br(2P3/2) channels. The dissociation dynamics of the 5s Rydberg state of CH3Br are also presented and analyzed.

Graphical abstract: Multiphoton dissociation dynamics of CH3Br

Article information


Submitted
09 Sep 2008
Accepted
18 Dec 2008
First published
09 Feb 2009

Phys. Chem. Chem. Phys., 2009,11, 2234-2240
Article type
Paper

Multiphoton dissociation dynamics of CH3Br

F. Wang, M. L. Lipciuc, X. Yang and T. N. Kitsopoulos, Phys. Chem. Chem. Phys., 2009, 11, 2234 DOI: 10.1039/B815824J

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