Multiphoton dissociation dynamics of CH3Br
Literature Information
M. Laura Lipciuc, Xueming Yang
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.
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