Vibrationally Mediated Photodissociation of CH3I [v1=1] at 277.5 nm: The Vibrationally Adiabatic Process
Vibrationally Mediated Photodissociation of CH3I [v1=1] at 277.5 nm: The Vibrationally Adiabatic Process
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DOI：
10.1021/jp401310g
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发表时间：
2013-05-30
影响因子：
2.9
通讯作者：
Zhu, Qihe
中科院分区：
文献类型：
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作者：
Hu, Lili;Zhou, Zhimin;Zhu, Qihe
从277.5 nm处C-H对称拉伸激发的CH3I[v(1)=1，v(2)=0]光解离的光碎片平移谱测得光碎片CH3(v(1)=0，v(2)=0)，(0，1)，(1，0)，(1，1)在I*通道中的振动分布分别为0.02，0.02，0.47，0.25，而CH3(1，0)，(1，1)在I通道中的振动分布分别为0.04，0.05。结果表明，大部分解离的CH3I[1，0]在光碎片CH3中保留了C-H对称伸缩振动v(1)=1，伞形弯曲模式下的振动分布不受原始CH对称伸缩激发的严重影响。CH3I[1，0]的光解主要遵循振动绝热过程。CH3I的初始振动激发[v(1)=1]很像旁观者，分子内的振动能重分配(IVR)在光解过程中没有起到明显的作用。
From the photofragment translational spectra of C-H symmetric stretch excited CH3I [v(1) = 1, v(2) = 0] photodissociatioin at 277.5 nm, the vibrational distribution of photofragments CH3 (v(1) = 0, v(2) = 0), (0,1), (1,0), (1,1) in the I* channel are measured to be 0.02, 0.02, 0.47, 0.25, and those of CH3 (1,0), (1,1) in the I channel are 0.04, 0.05, respectively. It shows that most of the dissociated CH3I [1,0] retain the C-H symmetric stretch vibration v(1) = 1 in the photofragments CH3, and the vibrational distribution in umbrella bending mode is not seriously affected by the original CH symmetric stretch excitation. The photodissociation of CH3I [1,0] mainly follows the vibrationally adiabatic process. The original vibrational excitation [v(1) = 1] of CH3I is quite like a spectator, and the intramolecular vibrational-energy redistribution (IVR) does not play obvious part during photodissociation.