Vacuum ultraviolet photodissociation dynamics of OCS via the F Rydberg state: The S(3PJ = 2, 1, 0) product channels

Tang，Ling1; Chen，Wentao1; Yuan，Daofu1; Yu，Shengrui2; Yang，Xueming3,4; Wang，Xingan1

2022-04-01

10.1063/1674-0068/cjcp2112271

化学物理学报   影响因子和分区

1674-0068

2327-2244

Vacuum ultraviolet (VUV) photodissociation dynamics of carbonyl sulfide was investigated experimentally by using a tunable photolysis light source and the time-sliced velocity map ion imaging technique. Ion images of S(3PJ =2, 1, 0) dissociation products were measured at five photolysis wavelengths from 133.26 nm to 139.96 nm, corresponding to the F Rydberg state of OCS. Two dissociation channels: S(3PJ)+CO(X1ς+) and S(3PJ)+CO(A3Π) were observed with the former being dominant. The vibrational states of CO co-products were partially resolved in the ion images. The product total kinetic energy releases, anisotropy parameters (β), and the branching ratios of high-lying CO vibrational states were determined for the S(3PJ)+CO(X1ς+) channel. We found that the anisotropy parameters suddenly changed from negative to positive when OCS was excited to the higher vibrational levels of the F state. Furthermore, the anisotropy parameters for S(3PJ) products of J = 2, 1, 0 were even different. These anomalous phenomena may result from the simultaneous existence of both parallel and perpendicular dissociation mechanisms, suggesting the involvement of other electronic states with different symmetry in the initially-excited energy region. This work provides a further understanding of the nonadiabatic couplings in the VUV photodissociation process of OCS.

Vacuum ultraviolet photodissociation Velocity map ion imaging Carbonyl sulfide

SCI ; EI

英语

其他

National Key R&D Program of China[2016YFF0200500] ; National Natural Science Foundation of China[22125302]

Physics

Physics, Atomic, Molecular & Chemical

WOS:000820672900001

CHINESE PHYSICAL SOC

20222012107757

Anisotropy ; Excited states ; Ions ; Kinetic energy ; Kinetics ; Light sources ; Photolysis ; Sulfur compounds

Fluid Flow, General:631.1 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Classical Physics; Quantum Theory; Relativity:931 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

2-s2.0-85129839929

Scopus

1.Department of Chemical Physics,University of Science and Technology of China,Hefei,230026,China
2.Hangzhou Institute of Advanced Studies,Zhejiang Normal University,Hangzhou,311231,China
3.State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,116023,China
4.School of Science,Southern University of Science and Technology,Shenzhen,518055,China

Tang，Ling,Chen，Wentao,Yuan，Daofu,et al. Vacuum ultraviolet photodissociation dynamics of OCS via the F Rydberg state: The S(3PJ = 2, 1, 0) product channels[J]. 化学物理学报,2022,35(2):249-256.

Tang，Ling,Chen，Wentao,Yuan，Daofu,Yu，Shengrui,Yang，Xueming,&Wang，Xingan.(2022).Vacuum ultraviolet photodissociation dynamics of OCS via the F Rydberg state: The S(3PJ = 2, 1, 0) product channels.化学物理学报,35(2),249-256.

Tang，Ling,et al."Vacuum ultraviolet photodissociation dynamics of OCS via the F Rydberg state: The S(3PJ = 2, 1, 0) product channels".化学物理学报 35.2(2022):249-256.