Strong isotope effect in the VUV photodissociation of HOD: A possible origin of D/H isotope heterogeneity in the solar nebula

Luo, Zijie1,2; Zhao, Yarui2; Chen, Zhichao2; Chang, Yao2; Zhang, Su-E2; Wu, Yucheng2; Yang, Jiayue2; Cheng, Yi1; Che, Li1; Wu, Guorong2; Xie, Daiqian3; Yang, Xueming2,4; Yuan, Kaijun2,5

2021-07-01

10.1126/sciadv.abg7775

Science Advances   影响因子和分区

2375-2548

The deuterium versus hydrogen (D/H) isotopic ratios are important to understand the source of water on Earth and other terrestrial planets. However, the determinations of D/H ratios suggest a hydrogen isotopic diversity in the planetary objects of the solar system. Photochemistry has been suggested as one source of this isotope heterogeneity. Here, we have revealed the photodissociation features of the water isotopologue (HOD) at lambda = 120.8 to 121.7 nm. The results show different quantum state populations of OH and OD fragments from HOD photodissociation, suggesting strong isotope effect. The branching ratios of H + OD and D + OH channels display large isotopic fractionation, with ratios of 0.70 +/- 0.10 at 121.08 nm and 0.49 +/- 0.10 at 121.6 nm. Because water is abundant in the solar nebula, photodissociation of HOD should be an alternative source of the D/H isotope heterogeneity. This isotope effect must be considered in the photochemical models.

SCI ; EI

英语

NI论文

通讯

Strategic Priority Research Program of the Chinese Academy of Sciences[XDB17000000] ; Chemical Dynamics Research Center[21688102] ; National Natural Science Foundation of China[21873099,21922306,21773236] ; Key Technology Team of the Chinese Academy of Sciences[GJJSTD20190002] ; Chinese Academy of Sciences[121421KYSB20170012] ; Liaoning Revitalization Talents Program[XLYC1907154]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000675849000008

AMER ASSOC ADVANCEMENT SCIENCE

20213010676207

Hydrogen ; Photodissociation ; Quantum theory

Physical Chemistry:801.4 ; Chemical Products Generally:804 ; Quantum Theory; Quantum Mechanics:931.4

Web of Science

1.Dalian Maritime Univ, Sch Sci, Dept Phys, 1 Linghai Rd, Dalian 116026, Liaoning, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam & Dalian Coherent L, 457 Zhongshan Rd, Dalian 116023, Peoples R China
3.Nanjing Univ, Sch Chem & Chem Engn, Inst Theoret & Computat Chem, Key Lab Mesoscop Chem, Nanjing 210093, Peoples R China
4.Southern Univ Sci & Technol, Coll Sci, Dept Chem, Shenzhen 518055, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Luo, Zijie,Zhao, Yarui,Chen, Zhichao,et al. Strong isotope effect in the VUV photodissociation of HOD: A possible origin of D/H isotope heterogeneity in the solar nebula[J]. Science Advances,2021,7(30).

Luo, Zijie.,Zhao, Yarui.,Chen, Zhichao.,Chang, Yao.,Zhang, Su-E.,...&Yuan, Kaijun.(2021).Strong isotope effect in the VUV photodissociation of HOD: A possible origin of D/H isotope heterogeneity in the solar nebula.Science Advances,7(30).

Luo, Zijie,et al."Strong isotope effect in the VUV photodissociation of HOD: A possible origin of D/H isotope heterogeneity in the solar nebula".Science Advances 7.30(2021).