Ion imaging studies of the photodissociation dynamics of CH2I2 at 248 nm
Ion imaging studies of the photodissociation dynamics of CH2I2 at 248 nm
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DOI：
10.1016/j.cplett.2013.10.029
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发表时间：
2013-12-18
影响因子：
2.8
通讯作者：
Lester, Marsha I.
中科院分区：
文献类型：
--
作者：
Lehman, Julia H.;Li, Hongwei;Lester, Marsha I.
利用速度图离子成像和I* (P-2(1/2))产物的光解离检测，研究了CH2I2在248 nm处的光解离。I*产物的速度分布表明，只有一小部分可用能量以平动能的形式释放，这与简单的脉冲模型相一致。对于由I*原子产生的CH2I自由基碎片，大部分多余能量被引导到< E-int > = 36.3 kcal mol（-1）的内激发。I*碎片的各向异性角分布和相应的正各向异性参数表明了迅速的解离和电子态混合。(C) 2013 Elsevier b.v.版权所有
The photodissociation of CH2I2 at 248 nm is investigated using velocity map ion imaging with photoionization detection of the I* (P-2(1/2)) products. The velocity distribution of the I* products reveals that only a small fraction of the available energy is released as translational energy, consistent with a simple impulsive model. Most of the excess energy is channeled into internal excitation with < E-int > = 36.3 kcal mol(-1) for CH2I radical fragments produced with I* atoms. The anisotropy angular distribution of the I* fragments and corresponding positive anisotropy parameter are indicative of prompt dissociation and electronic state mixing. (C) 2013 Elsevier B. V. All rights reserved.