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题名: Quantum state-selected photodissociation dynamics of H2O: Two-photon dissociation via the (C)over-tilde electronic state
作者: Yuan, Kaijun1;  Cheng, Yuan1;  Cheng, Lina1;  Guo, Qing1;  Dai, Dongxu1;  Yang, Xueming1;  Dixon, Richard N.2
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2010-10-07
DOI: 10.1063/1.3487736
卷: 133, 期:13
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: The photodissociation dynamics of H2O via the (C) over tilde state by two-photon excitation has been investigated using the H atom Rydberg tagging time-of-flight technique. The rotational resolved action spectrum of the (C) over tilde <-(X) over tilde transition band has been measured. The line widths show a pronounced dependence on the parent rotational excitation in the (C) over tilde state. The quantum state resolved OH product translational energy distributions and angular distributions have also been obtained. By carefully simulating these distributions, quantum state distributions of the OH product as well as the state-resolved angular anisotropy parameters were determined. The experimental results confirm the variation of two competitive predissociation pathways. A heterogeneous predissociation channel is mediated by rotational coupling to the (B) over tilde (1)A(1) state associated with the a-axis (k(a)'), and a homogeneous pathway arises from purely electronic coupling to the (A) over tilde B-1(1) state. We have also obtained the branching ratios of the OH(X) and OH(A) products, and related these to the (C) over tilde ->(A) over tilde and (C) over tilde ->(B) over tilde pathways. The branching ratios display a strong k(a)' dependence. (C) 2010 American Institute of Physics. [doi:10.1063/1.3487736]
关键词[WOS]: MULTIPHOTON IONIZATION SPECTROSCOPY ;  121.6 NM ;  PREDISSOCIATION-DYNAMICS ;  (D)OVER-TILDE STATES ;  D2O ;  OH ;  WATER ;  PHOTOFRAGMENTATION ;  DISTRIBUTIONS ;  FLUORESCENCE
语种: 英语
WOS记录号: WOS:000282699800020
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142125
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
2.Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England

Recommended Citation:
Yuan, Kaijun,Cheng, Yuan,Cheng, Lina,et al. Quantum state-selected photodissociation dynamics of H2O: Two-photon dissociation via the (C)over-tilde electronic state[J]. JOURNAL OF CHEMICAL PHYSICS,2010,133(13).
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