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题名: Angular momentum polarisation in the O(D-1) products of O-2 photolysis via the B-3 Sigma u(-) state
作者: Wu, Shiou-Min1;  Chestakov, Dmitri1;  Groenenboom, Gerrit C.1;  van der Zande, Wim J.1;  Parker, David H.1;  Wu, Guorong2;  Yang, Xueming2;  Vallance, Claire3
关键词: photodissociation ;  molecular oxygen ;  O(D-1) ;  polarisation ;  Schumann-Runge
刊名: MOLECULAR PHYSICS
发表日期: 2010
DOI: 10.1080/00268971003665113
卷: 108, 期:7-9, 页:1145-1157
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 first fully allowed spectroscopic transition in O-2 is the B-3 Sigma(-)(u) <- X-3 Sigma(-)(g) transition comprising the well-known Schumann-Runge bands and continuum. We report a velocity-map imaging study in which the O(D-1) angular momentum polarisation and O(P-3) spin-orbit branching ratios arising from this process have been measured. We show that direct 157 nm excitation into the Schumann-Runge continuum leads to extremely strong angular momentum polarisation in the O(D-1) product. Comparison with previous studies indicates that this is a general feature of dissociation via the B state. The fine structure branching ratios in the co-fragment O(P-3(J=2,1,0)) were measured to be 88.5 +/- 1.6 : 9.7 +/- 1.4 : 1.9 +/- 0.4. Based on a consideration of the Massey parameter for the system, the data were modelled using theoretical calculations based on adiabatic and diabatic models of the dissociation. While both models were able to describe some aspects of the dissociation accurately, neither was able to predict both the fine structure branching ratios of the O(P-3) products and the O(D-1(2)) alignment. We have also investigated O(D-1(2)) alignment arising from 203.8 and 205.5 nm photodissociation via the B-3 Sigma(-)(u) state of O-2 vibrationally excited to v=6-11. As in the 157 nm photodissciation of vibrationally ground state O-2, strong polarisation of the O(D-1(2)) photofragments is observed.
关键词[WOS]: 2-PHOTON NONRESONANT EXCITATION ;  MOLECULAR-OXYGEN ;  HERZBERG CONTINUUM ;  ATOMIC FRAGMENTS ;  PHOTODISSOCIATION ;  NM ;  SPECTRUM ;  ENERGY ;  DISTRIBUTIONS ;  ALIGNMENT
语种: 英语
WOS记录号: WOS:000278110600029
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141839
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.Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Liaoning, Peoples R China
3.Univ Oxford, Dept Chem, Chem Res Lab, Oxford OX1 3TA, England

Recommended Citation:
Wu, Shiou-Min,Chestakov, Dmitri,Groenenboom, Gerrit C.,et al. Angular momentum polarisation in the O(D-1) products of O-2 photolysis via the B-3 Sigma u(-) state[J]. MOLECULAR PHYSICS,2010,108(7-9):1145-1157.
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