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题名: Rotational state specific dissociation dynamics of D2O via the (C)over-tilde electronic state
作者: Cheng, Yuan1;  Cheng, Lina1;  Guo, Qing1;  Yuan, Kaijun1;  Dai, Dongxu1;  Wang, Xiuyan1;  Dixon, Richard N.2;  Yang, Xueming1
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2010-07-21
DOI: 10.1063/1.3457942
卷: 133, 期:3
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 rotational state resolved photodissociation dynamics of D2O via the C state has been investigated using the D-atom Rydberg "tagging" time-of-flight technique, with a tunable vacuum ultraviolet photolysis light source. The photodissociation action spectrum of the D2O (C) over tilde <-(X) over tilde (3p(z) <- 1b(1)) band has been recorded. The linewidths of rotational transitions have been determined by the Lorentzian profile simulation. Product kinetic energy distributions and angular distributions for individual rotational lines have been measured. From these distributions, the internal state distributions of the OD radical product as well as the state resolved angular anisotropy parameters for each rotational transition have been obtained. The dramatic variation of the OD product state distributions from different rotational excitations has been observed. These results suggest that there are two distinctive coupling channels from the (C) over tilde state to the lower electronic states: homogenous electronic coupling to the (A) over tilde(B-1(1)) state, resulting in a vibrationally hot OD(X (2)Pi) product and Coriolis-type coupling between the (C) over tilde(B-1(1)) state and the (B) over tilde((1)A(1)) state. Through the second mechanism, OD(X (2)Pi) as well as OD(A (2)Sigma(+)) products are produced. The OD(X (2)Pi) products are mainly populated in the vibrationally cold but extremely rotationally excited states. The comparison between the D2O and H2O results illustrates that the (C) over tilde(B-1(1)) -> (B) over tilde((1)A(1)) pathway is relatively larger in the D2O photodissociation as a consequence of the isotopic effect. (C) 2010 American Institute of Physics. [doi:10.1063/1.3457942]
关键词[WOS]: MULTIPHOTON IONIZATION SPECTROSCOPY ;  2ND ABSORPTION-BAND ;  OH PROMPT EMISSION ;  PHOTODISSOCIATION DYNAMICS ;  121.6 NM ;  HOD PHOTODISSOCIATION ;  VACUUM-ULTRAVIOLET ;  2 COMETS ;  H2O ;  WATER
语种: 英语
WOS记录号: WOS:000280596900029
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142067
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:
Cheng, Yuan,Cheng, Lina,Guo, Qing,et al. Rotational state specific dissociation dynamics of D2O via the (C)over-tilde electronic state[J]. JOURNAL OF CHEMICAL PHYSICS,2010,133(3).
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