Recently, Yuan Kaijun, a researcher at the Dalian Light Source Science Laboratory of the Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, and Yang Xueming, an academician of the Chinese Academy of Sciences, and Michael NR Ashfold, an academician of the Royal Academy of Sciences, have collaborated with Dalian Free Electron Laser to study hydrogen sulfide molecular photochemistry Another new achievement in the research of molecular chemistry of hydrogen sulfide.
Sulfur is one of the more abundant elements in the universe, and hydrogen sulfide is considered to be the preferential product of sulfide impacting interstellar dust. Due to the high abundance of hydrogen and high mobility in interstellar ice, the abundance of hydrogen sulfide SH (X) / H2S has become the target of scientists' research. Both hydrogen sulfide radicals and hydrogen sulfide molecules in the ground state can be detected in the interstellar medium, but the abundance value (13%) of the hydrogen sulfide molecules detected in the interstellar medium is much lower than the predicted value of the astrochemical model. The team recently conducted a systematic study on this subject using the Dalian Institute of Chemical Physics' extreme ultraviolet free electron laser device (Dalian Coherent Light Source). The researchers measured the photolysis products of hydrogen sulfide in the extreme ultraviolet band (122 to 155 nanometers), and the results showed that the quantum yield (Γ) of the SH (X) product had a significant wavelength dependence. Convolution of Γ, hydrogen sulfide molecular absorption spectrum and interstellar radiation field, about 26% of the photolysis will produce SH (X) product, the above results ignore the SH (X) product generated by the three-body dissociation channel, so we get The results are too large; if you consider the three-body dissociation channel, it is possible to obtain 13% of the photolysis will produce SH (X) products. These conclusions indicate that it is necessary to revise the relevant astrochemical models.
Related results were published in "Nature Communications" (Nature Communications). The research was supported by the National Natural Science Foundation of China Dynamic Chemistry Frontier Research Center project, the Chinese Academy of Sciences' Strategic Leading Science and Technology Special Category B "Essence and Regulation of Energy Chemical Conversion", and the National Natural Science Foundation General Project.
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