Photodissociation of H2S: A New Pathway for the Production of Vibrationally Excited Molecular Hydrogen in the Interstellar Medium

Zhao, Yarui1,6; Chen, Junjie2; Luo, Zijie6; Li, Zhenxing6; Yang, Shuaikang6; Chang, Yao6; An, Feng2; Chen, Zhichao6; Yang, Jiayue6; Wu, Guorong6; Zhang, Weiqing6; Hu, Xixi5; Xie, Daiqian2; Ding, Hongbin1; Yuan, Kaijun3,6; Yang, Xueming3,4,6

2022-10-01

10.1021/acs.jpclett.2c02757

Journal of Physical Chemistry Letters   Impact Factor & Quartile

1948-7185

Hydrogen sulfide (H2S) is the most abundant S-bearing molecule in the solar nebula. Although its photochemistry has been studied for decades, the H2 fragment channel is still not well-understood. Herein, we describe the photodissociation dynamics of H2S + hv -> S(1S) + H2(X1 sigma g+) with the excitation wavelength of 122 nm < lambda < 136 nm. The results reveal that the H2(X) fragments formed are significantly vibrationally excited, with the quantum yields of similar to 87% of H2(X) fragments populated in vibrational levels v '' = 3, 4, 5, and 6. Theoretical analysis suggest that these H2 products are formed on the H2S 41A ' state surface following a nonadiabatic transition via an avoided crossing from the 31A ' to 41A ' state. The estimated quantum yield of the S(1S) + H2 channel is similar to 0.05, implying this channel should be incorporated into the appropriate interstellar chemistry models.

SCI

English

NI Journal Papers

Others

National Natural Science Foundation of China["21922306","22225303","22122302","12047532","51837008"] ; National Natural Science Foundation of China (NSFC Center for Chemical Dynamics)[22288201] ; Key Technology Team of the Chinese Academy of Sciences[GJJSTD20220001] ; Innovation Program for Quantum Science and Technology[2021ZD0303304] ; Liaoning Revitalization Talents Program[XLYC1907154] ; China Postdoctoral Science Foundation[2021M693118] ; Guangdong Science and Technology Program["2019ZT08L455","2019JC01X091"] ; Shenzhen Science and Technology Program[ZDSYS20200421111001787]

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

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

WOS:000871019200001

AMER CHEMICAL SOC

Web of Science

1.Dalian Univ Technol, Chinese Minist Educ, Sch Phys, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China
2.Chem Engn Nanjing Univ, Inst Theoret & Computat Chem, Sch Chem, Key Lab Mesoscop Chem, Nanjing 210093, Peoples R China
3.Hefei Natl Lab, Hefei 230088, Peoples R China
4.Southern Univ Sci & Technol, Coll Sci, Dept Chem, Shenzhen 518005, Peoples R China
5.Nanjing Univ, Inst Brain Sci, Ctr Modern Anal, Kuang Yaming Honors Sch,Jiangsu Key Lab Vehicle Em, Nanjing 210023, Peoples R China
6.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian Coherent Light Source, Dalian 116023, Peoples R China

Zhao, Yarui,Chen, Junjie,Luo, Zijie,et al. Photodissociation of H2S: A New Pathway for the Production of Vibrationally Excited Molecular Hydrogen in the Interstellar Medium[J]. Journal of Physical Chemistry Letters,2022.

Zhao, Yarui.,Chen, Junjie.,Luo, Zijie.,Li, Zhenxing.,Yang, Shuaikang.,...&Yang, Xueming.(2022).Photodissociation of H2S: A New Pathway for the Production of Vibrationally Excited Molecular Hydrogen in the Interstellar Medium.Journal of Physical Chemistry Letters.

Zhao, Yarui,et al."Photodissociation of H2S: A New Pathway for the Production of Vibrationally Excited Molecular Hydrogen in the Interstellar Medium".Journal of Physical Chemistry Letters (2022).