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题名: Two-photon photodissociation dynamics of H2O via the D approximate to electronic state
作者: Yuan, Kaijun1;  Cheng, Lina1;  Cheng, Yuan1;  Guo, Qing1;  Dai, Dongxu1;  Yang, Xueming1
关键词: photodissociation ;  predissociation ;  reaction kinetics ;  rotational-vibrational energy transfer ;  Rydberg states ;  spectrochemical analysis ;  time of flight spectra ;  two-photon spectra ;  water
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2009-08-21
DOI: 10.1063/1.3168398
卷: 131, 期:7
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: Photodissociation dynamics of H2O via the D approximate to state by two-photon absorption have been investigated using the H-atom Rydberg tagging time-of-flight technique. The action spectrum of the D approximate to <- X approximate to transition band has been measured. The predissociation lifetime of the D approximate to state is determined to be about 13.5 fs. The quantum state-resolved OH product translational energy distributions and angular distributions have also been measured. By carefully simulating these distributions, quantum state distributions of the OH product as well as the state-resolved angular anisotropy parameters were determined. The most important pathway of the H2O dissociation via the D approximate to state leads to the highly rotationally excited OH(X,v=0) products. Vibrationally excited OH(X) products (up to v=10) and electronically excited OH(A,v=0,1,2) have also been observed. The OH(A)/OH(X) branching ratios are determined to be 17.9% at 244.540 nm (2 omega(1)=81 761.4 cm(-1)) and 19.9% at 244.392 nm (2 omega(2)=81 811 cm(-1)), which are considerably smaller than the value predicted by the theory. These discrepancies are attributed to the nonadiabatic coupling effect between the B approximate to and D approximate to surfaces at the bent geometry.
关键词[WOS]: DISSOCIATION DYNAMICS ;  121.6 NM ;  PREDISSOCIATION-DYNAMICS ;  MULTIPHOTON IONIZATION ;  (D)OVER-TILDE STATES ;  RYDBERG STATES ;  WATER ;  D2O ;  OH ;  PHOTOFRAGMENTATION
语种: 英语
WOS记录号: WOS:000269287200016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141482
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, Kaijun,Cheng, Lina,Cheng, Yuan,et al. Two-photon photodissociation dynamics of H2O via the D approximate to electronic state[J]. JOURNAL OF CHEMICAL PHYSICS,2009,131(7).
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