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题名: Photodissociation dynamics of methanol and ethanol at 157 nm
作者: Yuan, Kai-jun1;  Cheng, Yuan1;  Wang, Feng-yan1;  Yang, Xue-ming1
通讯作者: 杨学明
关键词: photodissociation dynamics ;  H atom channel ;  VUV photolysis
刊名: CHINESE JOURNAL OF CHEMICAL PHYSICS
发表日期: 2008-08-01
DOI: 10.1088/1674-0068/21/04/301-307
卷: 21, 期:4, 页:301-307
收录类别: SCI
文章类型: Article
部门归属: 11
项目归属: 1102
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Physics
英文摘要: 157 nm photodissociation of jet-cooled CH3OH and C2H5OH was studied using the high-n Rydberg atom time-of-flight (TOF) technique. TOF spectra of nascent H atom products were measured. Simulation of these spectra reveals three different atomic H loss processes: one front hydroxyl H elimination one from methyl (ethyl) H elimination, and one from secondary dissociation of the methoxy (ethoxy) radical. The relative branching ratio indicates secondary dissociation of ethoxy is less important than that of methoxy The average angular anisotropy parameter of methanol is negative (with beta approximate to-0.3), indicating the transition dipole moment is perpendicular to the C-O-H plane. The slightly more negative beta value of ethanol (with beta approximate to-0.4) implies that ethanol has a longer rotational period. These experimental results indicate that both systems undergo fast internal conversion to the 3s surface after it is excited to the 3p(x) surface, and then dissociate on the 3s surface. The translational energy distribution of the CH3OH products reveals extensive CH3 rocking or CH3 umbrella excitation in the CH3O radical. However the vibrational structures are not resolved in the C2H5O radical.
关键词[WOS]: CROSS-SECTIONS ;  SPECTRA ;  ENERGY ;  FLUORESCENCE ;  PHOTOLYSIS ;  PATHWAYS ;  RADICALS ;  PRODUCT ;  CH3OH
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000259288800001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/101233
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, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

Recommended Citation:
Yuan, Kai-jun,Cheng, Yuan,Wang, Feng-yan,et al. Photodissociation dynamics of methanol and ethanol at 157 nm[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2008,21(4):301-307.
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