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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 1
BKCSDE 33(1)
January 20, 2012 

Photodissociation of C3H5Br and C4H7Br at 234 nm
Hyun Kook Kim, Dababrata Paul, Kiryong Hong, Hana Cho, Kyoung-Seok Lee, Tae Kyu Kim*
Photodissociation, Cycloalkyl Halides, Curve-crossing, Cs symmetry, Ion-imaging
The photodissociation dynamics of cyclopropyl bromide (C3H5Br) and cyclobutyl bromide (C4H7Br) at 234 nm was investigated. A two-dimensional photofragment ion-imaging technique coupled with a [2+1] resonanceenhanced multiphoton ionization scheme was utilized to obtain speed and angular distributions of the nascent Br(2P3/2) and Br*(2P1/2) atoms. The recoil anisotropies for the Br and Br* channels were measured to be βBr = 0.92 ± 0.03 and βBr* = 1.52 ± 0.04 for C3H5Br and βBr = 1.10 ± 0.03 and βBr* = 1.49 ± 0.05 for C4H7Br. The relative quantum yield for Br was found to be ΦBr = 0.13 ± 0.03 and for C3H5Br and C4H7Br, respectively. The soft radical limit of the impulsive model adequately modeled the related energy partitioning. The nonadiabatic transition probability from the 3A' and 4A' potential energy surfaces was estimated and discussed.
143 - 148
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