Chem. Phys. Lett.
Volume 446, 31-35
15 August, 2007
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Photodissociation dynamics of CF₃Br at 225 nm: Direct dissociation via pseudo-linear geometry

Tae Kyu Kim¹, Keon Woo Lee², Kyoung-Seok Lee³, Eok Kyun Lee⁴ and Kyung-Hoon Jung⁴

¹ Department of Chemistry, Pusan National University, Pusan 609-735, Republic of Korea
² Information and Electronic Materials Research Institute, LG Chem/Research Park, Daejeon 305-380, Republic of Korea
³ Division of Metrology for Quality Life, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea
⁴ Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Daejon 305-701, Republic of Korea

Photodissociation dynamics of CF₃Br has been investigated at 225 nm, where the ³Q₀ state is accessed exclusively. It has been revealed that the ground state Br(²P_3/2) is hardly formed with a relative quantum yield less than 5%. The recoil anisotropy of Br^*(²P_1/2) has been found to have a limiting value, β_Br^* = 1.90 ± 0.05. The total translational energy distribution for the Br^* channel was well fitted by a Gaussian function with an average of 155 kJ/mol and a width of 30 kJ/mol. It has been proposed that the ³Q₀ state is not bent and the dissociation on this surface proceeds in a collinear geometry.