Dalian Coherent Light Source Reveals Strong Isotope Effects in Photodissociation of Water Isotopolog (Chemistry)

Recently, a research group led by Prof. YUAN Kaijun and Prof. YANG Xueming from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences revealed strong isotope effects in photodissociation of the water isotopologue (HOD) using the Dalian Coherent Light Source.

Their findings were published in Science Advances on July 23.

“Our experimental results illustrate dramatically different quantum state population distributions of OH and OD fragments from HOD photodissociation. The branching ratios of the H+OD and D+OH channels display large wavelength-dependent isotopic fractionation,” said Prof. YUAN.

Because water is one of the most abundant species in the solar nebula, photodissociation of water and its isotopologue by solar vacuum ultraviolet photons may be an alternative source of the D/H isotope heterogeneity, and this effect must be considered in photochemical models.

The photochemical processes identified in this work may vary the D/H isotopic ratios in the inner and outer regions, and/or in different periods of the solar nebula, which may cause the D/H isotope heterogeneity in the solar system.

This research was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences, Chemical Dynamics Research Center, and the National Natural Science Foundation of China.

Featured image: Dalian Coherent Light Source revealing strong isotope effects in water photochemistry © DICP

Reference: Zijie Luo, Yarui Zhao, Zhichao Chen, Yao Chang, Su-e Zhang, Yucheng Wu, Jiayue Yang, Yi Cheng, Li Che, Guorong Wu, Daiqian Xie, Xueming Yang, Kaijun Yuan, “Strong isotope effect in the VUV photodissociation of HOD: A possible origin of D/H isotope heterogeneity in the solar nebula”, Science Advances  21 Jul 2021: Vol. 7, no. 30, eabg7775 DOI: 10.1126/sciadv.abg7775

Provided by DICP

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