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Two-photon photodissociation dynamics of H2O via the D approximate to electronic state
Yuan, Kaijun; Cheng, Lina; Cheng, Yuan; Guo, Qing; Dai, Dongxu; Yang, Xueming
KeywordPhotodissociation Predissociation Reaction Kinetics Rotational-vibrational Energy Transfer Rydberg States Spectrochemical Analysis Time Of Flight Spectra Two-photon Spectra Water
Source PublicationJOURNAL OF CHEMICAL PHYSICS
2009-08-21
DOI10.1063/1.3168398
Volume131Issue:7
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectPhysics, Atomic, Molecular & Chemical
WOS Research AreaPhysics
WOS KeywordDISSOCIATION DYNAMICS ; 121.6 NM ; PREDISSOCIATION-DYNAMICS ; MULTIPHOTON IONIZATION ; (D)OVER-TILDE STATES ; RYDBERG STATES ; WATER ; D2O ; OH ; PHOTOFRAGMENTATION
AbstractPhotodissociation 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.
Language英语
WOS IDWOS:000269287200016
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/141482
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
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).
APA Yuan, Kaijun,Cheng, Lina,Cheng, Yuan,Guo, Qing,Dai, Dongxu,&Yang, Xueming.(2009).Two-photon photodissociation dynamics of H2O via the D approximate to electronic state.JOURNAL OF CHEMICAL PHYSICS,131(7).
MLA Yuan, Kaijun,et al."Two-photon photodissociation dynamics of H2O via the D approximate to electronic state".JOURNAL OF CHEMICAL PHYSICS 131.7(2009).
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