Photodissociation Dynamics of OCS near 150 nm: The S(S-1(J=0)) and S(P-3(J=2,1,0)) Product Channels

Xie, Ting1,2,3; Chen, Wentao1,2; Yuan, Daofu1,2; Yu, Shengrui4; Fu, Bina3; Yuan, Kaijun3; Yang, Xueming3,5; Wang, Xingan1,2

2020-08-13

10.1021/acs.jpca.0c03823

JOURNAL OF PHYSICAL CHEMISTRY A   影响因子和分区

1089-5639

1520-5215

Vacuum ultraviolet photodissociation dynamics of carbonyl sulfide (OCS) was investigated by using the time-sliced velocity map ion imaging technique. Images of the S(S-1(J=0)) and S(P-3(J=2,1,0)) photofragments formed in the OCS photodissociation were acquired at six photolysis wavelengths from 147.24 to 156.48 nm. Vibrational states of the CO coproducts were partially resolved and identified in the images. Two main dissociation product channels, namely, the spin-allowed S(S-1(J=0)) + CO(X-1 Sigma(+)(g)) and spin-forbidden S(P-3(J=2,1,0)) + CO(X-1 Sigma(+)(g)), were observed. At each photolysis wavelength, the total kinetic energy releases, the relative population of different CO vibrational states, and the anisotropic parameters were derived. Variations of the relative population were noticed between different spin-orbit states of the S(P-3(J)) channel. It was found that the S(S-1(J=0)) + CO(X-1 Sigma(+)(g)) channel is dominated by the (1)Sigma(+) <- (1)Sigma(+) parallel transition of OCS. Interestingly, two types of anisotropic parameters are found at different photolysis wavelengths for the spin-forbidden S(P-3(J=2,1,0)) + CO(X-1 Sigma(+)(g)) product channel. The anisotropic parameters at 147.24 and 150.70 nm are significantly smaller than at the other four photolysis wavelengths. This phenomenon indicates two different nonadiabatic pathways are responsible for the spin-forbidden channels, which is consistent with the barrier structure in the exit channel of one of the triplet states.

PHOTOFRAGMENT EXCITATION SPECTROSCOPY CARBONYL SULFIDE NITROUS-OXIDE SULFUR IMPACT

SCI ; EI

英语

其他

Chemistry ; Physics

Chemistry, Physical ; Physics, Atomic, Molecular & Chemical

WOS:000562942600003

AMER CHEMICAL SOC

20203809202868

Kinetic energy ; Sulfur compounds ; Anisotropy ; Photolysis ; Photodissociation

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

CHEMISTRY

1.Univ Sci & Technol China, Hefei Natl Lab Mat Sci Microscale, Hefei 230026, Peoples R China;
2.Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China;
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China;
4.Zhejiang Normal Univ, Hangzhou Inst Adv Studies, Hangzhou 311231, Zhejiang, Peoples R China;
5.Southern Univ Sci & Technol, Coll Sci, Shenzhen 518055, Peoples R China

Xie, Ting,Chen, Wentao,Yuan, Daofu,et al. Photodissociation Dynamics of OCS near 150 nm: The S(S-1(J=0)) and S(P-3(J=2,1,0)) Product Channels[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2020,124(32):6420-6426.

Xie, Ting.,Chen, Wentao.,Yuan, Daofu.,Yu, Shengrui.,Fu, Bina.,...&Wang, Xingan.(2020).Photodissociation Dynamics of OCS near 150 nm: The S(S-1(J=0)) and S(P-3(J=2,1,0)) Product Channels.JOURNAL OF PHYSICAL CHEMISTRY A,124(32),6420-6426.

Xie, Ting,et al."Photodissociation Dynamics of OCS near 150 nm: The S(S-1(J=0)) and S(P-3(J=2,1,0)) Product Channels".JOURNAL OF PHYSICAL CHEMISTRY A 124.32(2020):6420-6426.