Vibrationally excited molecular hydrogen production from the water photochemistry

Chang, Yao1; An, Feng2; Chen, Zhichao1; Luo, Zijie1; Zhao, Yarui1; Hu, Xixi3; Yang, Jiayue1; Zhang, Weiqing1; Wu, Guorong1; Xie, Daiqian2; Yuan, Kaijun1,4; Yang, Xueming1,5

2021-11-02

10.1038/s41467-021-26599-9

NATURE COMMUNICATIONS   影响因子和分区

2041-1723

Vibrationally excited molecular hydrogen has been commonly observed in the dense photo-dominated regions (PDRs). It plays an important role in understanding the chemical evolution in the interstellar medium. Until recently, it was widely accepted that vibrational excitation of interstellar H-2 was achieved by shock wave or far-ultraviolet fluorescence pumping. Here we show a further pathway to produce vibrationally excited H-2 via the water photochemistry. The results indicate that the H-2 fragments identified in the O(S-1) + H-2 (X-1 Sigma(g)+) channel following vacuum ultraviolet (VUV) photodissociation of H2O in the wavelength range of lambda = similar to 100-112 nm are vibrationally excited. In particular, more than 90% of H-2(X) fragments populate in a vibrational state v= 3 at lambda similar to 112.81 nm. The abundance of water and VUV photons in the interstellar space suggests that the contributions of these vibrationally excited H-2 from the water photochemistry could be significant and should be recognized in appropriate interstellar chemistry models.

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National Natural Science Foundation of China[21922306,21873099,21733006,22073042,22122302,12047532] ; National Natural Science Foundation of China (NSFC Center for Chemical Dynamics)[21688102] ; Key Technology Team of the Chinese Academy of Sciences[GJJSTD20190002] ; Liaoning Revitalization Talents Program[XLYC1907154] ; international partnership program of Chinese Academy of Sciences[121421KYSB20170012]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000714189200009

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1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam & Dalian Coherent L, 457 Zhongshan Rd, Dalian 116023, Peoples R China
2.Nanjing Univ, Inst Theoret & Computat Chem, Key Lab Mesoscop Chem, Sch Chem & Chem Engn, Nanjing 210093, Peoples R China
3.Nanjing Univ, Kuang Yarning Honors Sch, Inst Brain Sci, Nanjing 210023, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Southern Univ Sci & Technol, Coll Sci, Dept Chem, Shenzhen 518055, Peoples R China

Chang, Yao,An, Feng,Chen, Zhichao,et al. Vibrationally excited molecular hydrogen production from the water photochemistry[J]. NATURE COMMUNICATIONS,2021,12(1).

Chang, Yao.,An, Feng.,Chen, Zhichao.,Luo, Zijie.,Zhao, Yarui.,...&Yang, Xueming.(2021).Vibrationally excited molecular hydrogen production from the water photochemistry.NATURE COMMUNICATIONS,12(1).

Chang, Yao,et al."Vibrationally excited molecular hydrogen production from the water photochemistry".NATURE COMMUNICATIONS 12.1(2021).