Photodissociation of iodocyclohexane at 266 and 277 nm: Energy partitioning and curve crossing analysis

Photodissociation of iodocyclohexane at 266 and 277 nm: Energy partitioning and curve crossing analysis
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碘环己烷在 266 和 277 nm 处的光解:能量分配和曲线交叉分析

DOI:
10.1016/j.optcom.2009.02.050
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发表时间:
2009-06
影响因子:
2.4
通讯作者:
张冰
张冰
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
张冰

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采用离子速度成像技术研究了碘环己烷(C6H11I)在266和277nm的光解动力学。得到了I (2P3/2)(记为I)和I (2P1/2)(记为I*)片段的速度分布、角分布和相对量子产率。能量分配表明,在两个解离通道中,约70%的可用能量进入光碎片的内部激发。从角分布中,我们发现I*在对应激发波长处的各向异性参数β值小于I。根据测量的角分布和相对量子产率,确定了每个激发态对产物的相对分数。3q0和1q1态之间的曲线交叉概率在266nm处为0.503,在277nm处为0.443。
The photodissociation dynamics of iodocyclohexane (C6H11I) at 266 and 277nm has been investigated by ion velocity imaging technique. The velocity distributions, angular distributions and relative quantum yields are obtained for I (2P3/2) (denoted I) and I (2P1/2) (denoted I*) fragments. The energy partitioning shows that about 70% of the available energy goes into the internal excitation of the photofragments for both dissociation channels. From the angular distributions, we found the value of the anisotropy parameter β for I* at the corresponding excitation wavelength was less than that for I. Based on the measured angular distributions and relative quantum yields, the relative fractions of each excited state to the products are determined. The curve crossing probabilities between the3Q0and1Q1states are determined 0.503 at 266nm and 0.443 at 277nm.
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