溴甲烷和溴甲烷阳离子的UV光解离速度图成像研究
UV photodissociation of methyl bromide and methyl bromide cation studied by velocity map imaging
摘要：
采用速度图成像技术，在215.9 nm处测量了溴甲烷光解产生的CH 3（v2= 0，1，2，3）和Br（2 P3/2，2 P1/2）光碎片的动能和角分布。这些结果明确地表明，Br和Br* 形成通道导致甲基片段的伞模的不同振动激发。低能量结构特征出现在图像上，这是由CH 3Br+在330 nm附近的光解离引起的。探测激光光子的多余能量被引导到CH 3+的振动激发中，很可能是在nu_4简并弯曲中
英文摘要：
We employ the velocity map imaging technique to measure kinetic energy and angular distributions of state selected CH3 (v2=0,1,2,3) and Br (2P3/2,2P1/2) photofragments produced by methyl bromide photolysis at 215.9 nm. These results show unambiguously that the Br and Br* forming channels result in different vibrational excitation of the umbrella mode of the methyl fragment. Low energy structured features appear on the images which arise from CH3Br+ photodissociation near 330 nm. The excess energy of the probe laser photon is channeled into CH3+ vibrational excitation, most probably in the nu_4 degenerate bend
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