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题名: Photodissociation dynamics of H2O: Effect of unstable resonances on the (B)over-tilde (1)A(1) electronic state
作者: Cheng, Yuan1;  Yuan, Kaijun1;  Cheng, Lina1;  Guo, Qing1;  Dai, Dongxu1;  Yang, Xueming1
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2011-02-14
DOI: 10.1063/1.3554213
卷: 134, 期:6
收录类别: SCI
文章类型: Article
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: We report a tunable vacuum ultraviolet photodissociation study of H2O from different unstable resonances in the (B) over tilde (1)A(1) electronic state, using the H-atom Rydberg tagging technique. The quantum state resolved OH product translational energy distributions and angular distributions have been measured. Experimental results illustrate, for the first time, that excitation to the different unstable resonances has very different effect on the OH(X) and OH(A) product channels. The OH(X) product rotational distributions vary only slightly, while the OH(A) product rotational distributions and state-resolved angular distributions change dramatically as the photolysis energy increases. Effect of parent rotational excitation on the OH(A) product has also been observed. Through careful simulations to the experimental spectra, OH(A)/OH(X) branching ratios have been determined at five photolysis wavelengths. The general agreement between theory and experiment in the branching ratios is good. The branching ratios for the OH(A) product from different parent rotational levels are close to the nuclear spin-statistics value, which is also consistent with the extremely low rotational temperature of the H2O beam in the current experiment. (C) 2011 American Institute of Physics. [doi:10.1063/1.3554213]
关键词[WOS]: DIFFUSE VIBRATIONAL-STRUCTURES ;  DISSOCIATION DYNAMICS ;  121.6 NM ;  ABSORPTION-SPECTRA ;  VACUUM-ULTRAVIOLET ;  WATER ;  D2O ;  DISTRIBUTIONS ;  BAND ;  OH
语种: 英语
WOS记录号: WOS:000287327400021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142514
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:
Cheng, Yuan,Yuan, Kaijun,Cheng, Lina,et al. Photodissociation dynamics of H2O: Effect of unstable resonances on the (B)over-tilde (1)A(1) electronic state[J]. JOURNAL OF CHEMICAL PHYSICS,2011,134(6).
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