Scientists reveal full-band photochemical images of interstellar hydrogen sulfide molecules

Recently, the team of Yuan Kaijun, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, cooperated with Mike Ashfold, a professor at the University of Bristol, and Hu Xixi, a professor at Nanjing University, to reveal the photochemical kinetics of high-electron excited states of interstellar hydrogen sulfide molecules, and construct a full-band and full-channel dissociation kinetic image of hydrogen sulfide. The results were published in Chemical Science and were selected as cover articles.

Hydrogen sulfide molecules are one of the most important molecules in the solar nebula, and their photochemical processes are of great significance for the origin and evolution of interstellar media such as sulfur elements, sulfur hydrogen radicals and hydrogen. Although the photodissociation of hydrogen sulfide molecules has received more and more attention, high-resolution and complete kinetic images have not been constructed at home and abroad.

Full-band photochemical image of interstellar hydrogen sulfide molecules (Photo courtesy of Dalian Chemical)

In this work, Yuan Kaijun’s team used a Dalian coherent light source combined with Ryedberg hydrogen atom time-of-flight spectroscopy and time-slice ion imaging technology to measure the photochemistry of all product channels of hydrogen sulfide in the extreme ultraviolet band. The experimental results show that the kinetics and quantum yield of hydrogen sulfide photodissociation products have obvious wavelength-dependent characteristics. Theoretical calculations elucidate the complex non-adiabatic dissociation characteristics in the photolysis process of hydrogen sulfide by constructing a high-electron excitation potential energy surface.

This work not only provides a scientific basis for the construction of interstellar sulfur chemical models, but also provides a research example for the development of quantum dynamics theory. (Source: Sun Danning, China Science News)

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