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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 12
BKCSDE 30(12)
December 20, 2009 

 
Title
Photodissociation Dynamics of C2H4BrCl:
Nonadiabatic Dynamics with Intrinsic Cs Symmetry
Author
Kyoung Seok Lee, Dababrata Paul, Kiryong Hong, Ha Na Cho, Kwang Woo Jung*, Tae Kyu Kim*
Keywords
Photodissociation dynamics, Alkyl halides, Curve-crossing, Cs symmetry, Ion-imaging
Abstract
The photodissociation dynamics of 1,2-bromochloroethane (C2H4BrCl) was investigated near 234 nm. A two-dimensional photofragment ion-imaging technique coupled with a [2+1] resonance-enhanced multiphoton ionization scheme was utilized to obtain speed and angular distributions of the nascent Br(2P3/2) and Br*(2P1/2) atoms. The total translational energy distributions for the Br and Br* channels were well characterized by Gaussian functions with average translational energies of 100 and 84 kJ/mol, respectively. The recoil anisotropies for the Br and Br* channels were measured to be β = 0.49 ± 0.05 for Br and 1.55 ± 0.05 for Br*. The relative quantum yield for Br* was found to be ΦBr* = 0.33 ± 0.03. The probability of nonadiabatic transition between A' states was estimated to be 0.46. The relevant nonadiabatic dynamics is discussed in terms of interaction between potential energy surfaces in Cs symmetry.
Page
2962 - 2968
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