Vibrationally Mediated Photodissociation of CH3I [v1 = 1] at 277.5 nm: The Vibrationally Adiabatic Process

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• 作者：Lili Hu ; Zhimin Zhou ; Changwu Dong ; Lijuan Zhang ; Yikui Du ; Min Cheng ; Qihe Zhu
• 刊名：The Journal of Physical Chemistry A
• 出版年：2013
• 出版时间：May 30, 2013
• 年：2013
• 卷：117
• 期：21
• 页码：4352-4357
• 全文大小：299K
• 年卷期：v.117,no.21(May 30, 2013)
• ISSN：1520-5215

文摘

From the photofragment translational spectra of C鈥揌 symmetric stretch excited CH₃I [v₁ = 1, v₂ = 0] photodissociatioin at 277.5 nm, the vibrational distribution of photofragments CH₃ (v₁ = 0, v₂ = 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鈥揌 symmetric stretch vibration v₁ = 1 in the photofragments CH₃, and the vibrational distribution in umbrella bending mode is not seriously affected by the original C鈥揌 symmetric stretch excitation. The photodissociation of CH₃I [1,0] mainly follows the vibrationally adiabatic process. The original vibrational excitation [v₁ = 1] of CH₃I is quite like a spectator, and the intramolecular vibrational-energy redistribution (IVR) does not play obvious part during photodissociation.