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题名: Vibrationally Resolved Photofragment Translational Spectroscopy of CH3I from 277 to 304 nm with Increasing Effect of the Hot Band
作者: Cheng, Min1, 2;  Yu, Zijun1, 2;  Hu, Lili1, 2;  Yu, Dan1, 2;  Dong, Changwu1, 2;  Du, Yikui1;  Zhu, Qihe1
刊名: JOURNAL OF PHYSICAL CHEMISTRY A
发表日期: 2011-02-24
DOI: 10.1021/jp106624q
卷: 115, 期:7, 页:1153-1160
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: The photodissociation dynamics of CH3I from 277 to 304 nm is studied with our mini-TOF photofragment translational spectrometer. A single laser beam is used for both photodissociation of CH3I and REMPI detection of iodine. Many resolved peaks in each photofragment translational spectrum reveal the vibrational states of the CH3 fragment. There are some extra peaks showing the existence of the hot-band states of CH3I. After careful simulation with consideration of the hot-band effect, the distribution of vibrational states of the CH3 fragment is determined. The fraction sigma of photofragments produced from the hot-band CH3I varies from 0.07 at 277.38 nm to 0.40 at 304.02 nm in the I* channel and from 0.05 at 277.87 nm to 0.16 at 304.67 nm in the I channel. E-int/E-avl of photofragments from ground-state CH3I remains at about 0.03 in the I* channel for all four wavelengths, but E-int/E-avl decreases from 0.09 at 277.87 run to 0.06 at 304.67 nm in the I channel. From the ground-state CH3I, the quantum yield Phi(I*) is determined to be 0.59 at 277 nm and 0.05 at 304 nm. The curve-crossing probability P-cc from the hot-band CH3I is lower than that from the ground-state CH3I. The potential energy at the curve-crossing point is determined to be 32 740 cm(-1).
关键词[WOS]: POTENTIAL-ENERGY SURFACES ;  METHYL-IODIDE PHOTODISSOCIATION ;  PARENT BENDING MOTION ;  ORBIT AB-INITIO ;  ALKYL IODIDES ;  EMISSION-SPECTROSCOPY ;  UMBRELLA MODE ;  DIODE-LASER ;  WAVE-PACKET ;  DYNAMICS
语种: 英语
WOS记录号: WOS:000287337900001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142490
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Cheng, Min,Yu, Zijun,Hu, Lili,et al. Vibrationally Resolved Photofragment Translational Spectroscopy of CH3I from 277 to 304 nm with Increasing Effect of the Hot Band[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2011,115(7):1153-1160.
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