Photodissociation dynamics of CF3Br at 234 nm: An implication of symmetry reduction during photodissociation
Photodissociation dynamics of CF3Br at 234 nm: An implication of symmetry reduction during photodissociation
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DOI：
10.1063/1.1419063
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发表时间：
2001-12
影响因子：
4.4
通讯作者：
Tae Kyu Kim;Moonsoo Park;Keon Woo Lee;K. Jung
中科院分区：
文献类型：
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作者：
Tae Kyu Kim;Moonsoo Park;Keon Woo Lee;K. Jung
利用二维光碎片离子成像技术结合状态选择性共振增强多光子电离方案，研究了CF3Br在a波段的光解动力学。Br（2P3/2）和Br*(2P1/2)通道的总平动能用高斯函数表征，平均平动能分别为183和151 kJ/mol。测得Br和Br*的反冲各向异性分别为β=0.66和1.83。结果表明，Br*的相对量子产率为0.80。Br的反冲各向异性减小是由于1Q1和3Q0态之间的非绝热耦合。通过从C3v到Cs的对称还原引起的扭曲途径解离的分子比例估计为0.11。
The photodissociation dynamics of CF3Br in the A-band has been investigated utilizing a two-dimensional photofragment ion-imaging technique coupled with a state-selective resonance-enhanced multiphoton ionization scheme. The total translational energy distributions for the Br(2P3/2) and Br*(2P1/2) channels are well characterized by Gaussian functions with average translational energies of 183 and 151 kJ/mol, respectively. The recoil anisotropies were measured to be β=0.66 for Br and 1.83 for Br*. It was found that Br* production is preferred, with a relative quantum yield of 0.80. The reduction in the recoil anisotropy for Br results from nonadiabatic coupling between the 1Q1 and 3Q0 states. The fraction of molecules that dissociate via a distorted pathway induced by symmetry reduction from C3v to Cs is estimated to be 0.11.