Observation of the Carbon Elimination Channel in Vacuum Ultraviolet Photodissociation of OCS

Chen, Wentao1,2; Zhang, Liang1,2; Yuan, Daofu1,2; Chang, Yao1,2,3; Yu, Shengrui4; Wang, Siwen1,2; Wang, Tao5; Jiang, Bin1,2; Yuan, Kaijun3; Yang, Xueming3,5; Wang, Xingan1,2

2019-09-05

10.1021/acs.jpclett.9b01811

Journal of Physical Chemistry Letters   影响因子和分区

1948-7185

The textbook mechanism for OCS photodissociation mainly involves the CO + S or CS + O product channel via a single bond fission. However, a third dissociation channel concerning the cleavage of both C-S and C-O bonds yielding SO + C products, though thermodynamically allowed, has never been verified experimentally to date. By using a tunable vacuum ultraviolet laser light and time-sliced velocity map ion imaging technique, we have clearly observed the SO(X-3 Sigma(-)) + C(P-3(j=0)) products as the vacuum ultraviolet laser photon energy gradually exceeds its thermodynamic threshold. The corresponding SO(X-3 Sigma(-)) coproducts are highly vibrationally excited and show varying angular distributions from isotropic to anisotropic as the excitation photon energy increases. Theoretical analysis suggests that a fast nonadiabatic pathway plays a dominant role in the formation of the anisotropic SO products. That isotropic products arise as the excitation photon energies approach the thermodynamic threshold can be reasonably by the "roaming mechanism".

SCI ; EI

英语

NI期刊

其他

Strategic Priority Research Program of Chinese Academy of Sciences[XDB17000000]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Atomic, Molecular & Chemical

WOS:000484884300003

AMER CHEMICAL SOC

20193407342090

Anisotropy ; Carbon ; Imaging techniques ; Photodissociation ; Ultraviolet lasers

Lasers, General:744.1 ; Imaging Techniques:746 ; Physical Chemistry:801.4 ; Chemical Products Generally:804 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Atomic and Molecular Physics:931.3

Web of Science

1.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
2.Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Anhui, 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, Sch Sci, Dept Chem, Shenzhen 518055, Peoples R China

Chen, Wentao,Zhang, Liang,Yuan, Daofu,et al. Observation of the Carbon Elimination Channel in Vacuum Ultraviolet Photodissociation of OCS[J]. Journal of Physical Chemistry Letters,2019,10(17):4783-4787.

Chen, Wentao.,Zhang, Liang.,Yuan, Daofu.,Chang, Yao.,Yu, Shengrui.,...&Wang, Xingan.(2019).Observation of the Carbon Elimination Channel in Vacuum Ultraviolet Photodissociation of OCS.Journal of Physical Chemistry Letters,10(17),4783-4787.

Chen, Wentao,et al."Observation of the Carbon Elimination Channel in Vacuum Ultraviolet Photodissociation of OCS".Journal of Physical Chemistry Letters 10.17(2019):4783-4787.