Photofragmentation of CH3I: Vibrational distribution of the CH3 fragment
Photofragmentation of CH3I: Vibrational distribution of the CH3 fragment
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DOI：
10.1063/1.442538
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发表时间：
1981-10
影响因子：
4.4
通讯作者：
R. K. Sparks;K. Shobatake;L. Carlson;Yuan‐Pern Lee
中科院分区：
文献类型：
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作者：
R. K. Sparks;K. Shobatake;L. Carlson;Yuan‐Pern Lee
采用高分辨率光碎片光谱法研究了CH3I在266 nm的光解作用。该分辨率足以确定I*(2P1/2)+CH3产物通道的CH3伞运动的振动居数。还确定了I(2P3/2)+CH3产物通道的近似振动分布。估计CH3+I*(2P1/2)通道的旋转能量分布在每个CH3振动态的数列或小于600 cm−1。根据I*+CH3通道的能量阈值，确定了C-I键解离能的精细化值为53.3±0.7 kcal/mol。讨论了I*+CH3通道的振动能量分布与Shapiro和Bersohn最近的模型计算的关系，并考虑了计算和测量分布之间差异的可能解释。
The photodissociation of CH3I at 266 nm is investigated by means of high resolution photofragment spectroscopy. The resolution is sufficient to determine the vibrational population of the CH3 umbrella motion for the I*(2P1/2)+CH3 product channel. An approximate vibrational distribution for the I(2P3/2)+CH3 product channel is also determined. The rotational energy distribution for the CH3+I*(2P1/2) channel is estimated to be on the order of or less than 600 cm−1 wide for each of the CH3 vibrational states. A refined value for the C–I bond dissociation energy of 53.3±0.7 kcal/mole is determined from the energy threshold for the I*+CH3 channel. The vibrational energy distribution for the I*+CH3 channel is discussed in relation to a recent model calculation by Shapiro and Bersohn and possible explanations for the discrepency between the calculated and the measured distributions are considered.