Vacuum ultraviolet photodissociation of OCS via the 2(1)Sigma(+) state: the S(D-1(2)) elimination channel

Li, Zheng1; Liao, Hong1; Yang, Wenshao1; Yang, Xueming1,2,3; Yu, Shengrui1

2022-07-01

10.1039/d2cp02044k

PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Impact Factor & Quartile

1463-9076

1463-9084

The photodissociation of OCS is necessary to model the primary photochemical processes of OCS in the global cycling of sulfur and interstellar photochemistry. Here, by combining the time-sliced velocity-map ion imaging technique with the single vacuum ultraviolet photon ionization method, we have studied the CO((1)Sigma(+), v) + S(D-1(2)) photoproduct channel from the OCS photodissociation via the eight different vibrational resonances (v(1)' = 1-8) in the 2(1)Sigma(+) (v(1)', 1, 0) <- X-1 Sigma(+) (0, 0, 0) band. From the measured S(D-1(2)) images, the wavelength-dependent CO((1)Sigma(+), v) vibrational state populations have been obtained in the wavelength range of 142.98-154.37 nm. The majority of the CO((1)Sigma(+), v) photoproducts are shown to abruptly populate from low vibrational states to high vibrational states as the photolysis wavelength decreases from 152.38 to 148.92 nm. The anisotropy parameters (beta) for the CO((1)Sigma(+), v) + S( 1 D 2 ) channel have also been determined from the images of the S(D-1(2)) photoproducts. It is found that the vibrational state-specific beta-values present a similar decreasing trend with increasing CO vibrational excitation for all the eight vibrational resonances of OCS*(2(1)Sigma(+)). These observations indicate that there is a possibility that more than one non-adiabatic dissociation pathways with different dissociation lifetimes are involved in the formation of CO((1)Sigma(+)) + S(D-1(2)) photoproducts from the initial vibronic levels of the 2(1)Sigma(+) state to the final dissociative state.

SCI ; EI

English

Corresponding

National Natural Science Foundation of China["22173082","21773213"] ; Zhejiang Provincial Natural Science Foundation of China["LY22B030005","LZ22B030003"]

Chemistry ; Physics

Chemistry, Physical ; Physics, Atomic, Molecular & Chemical

WOS:000827052700001

ROYAL SOC CHEMISTRY

20223112452210

Excited states ; Photoionization ; Photolysis

Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

CHEMISTRY

Web of Science

1.Zhejiang Normal Univ, Hangzhou Inst Adv Studies, 1108 Gengwen Rd, Hangzhou 311231, Zhejiang, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, 457 Zhongshan Rd, Dalian 116023, Liaoning, Peoples R China
3.Southern Univ Sci & Technol, Coll Sci, Dept Chem, 1088 Xueyuan Rd, Shenzhen 518055, Peoples R China

Li, Zheng,Liao, Hong,Yang, Wenshao,et al. Vacuum ultraviolet photodissociation of OCS via the 2(1)Sigma(+) state: the S(D-1(2)) elimination channel[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2022,24:17870-17878.

Li, Zheng,Liao, Hong,Yang, Wenshao,Yang, Xueming,&Yu, Shengrui.(2022).Vacuum ultraviolet photodissociation of OCS via the 2(1)Sigma(+) state: the S(D-1(2)) elimination channel.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,24,17870-17878.

Li, Zheng,et al."Vacuum ultraviolet photodissociation of OCS via the 2(1)Sigma(+) state: the S(D-1(2)) elimination channel".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 24(2022):17870-17878.