Anguang Institute of Vacuum UV Photoionization Mass Spectrometry and its application research have made important progress

China Instrument Network Instrument Development: Free radicals in the atmosphere have short lifetimes and strong chemical reactivity, often acting as intermediates in atmospheric oxidation processes. They play a crucial role in these reactions, making the study of their key chemical reactions essential for understanding atmospheric oxidation properties and pollution causes. One of the major challenges in this field is the comprehensive detection of free radical reaction species—such as reactants, transient intermediates, and products—and the accurate identification of structurally different isomers. These issues remain both hot and difficult topics in atmospheric chemistry research. Recently, the research team led by An Guangshang and Zhang Weijun has made significant progress in vacuum ultraviolet photoionization mass spectrometry and its application in free radical reaction kinetics. Their work, titled "A vacuum ultraviolet photoionization time-of-flight mass spectrometer with high sensitivity for study of gas phase radical reaction in flow tube," was published online in the *International Journal of Chemical Kinetics* (DOI: 10.1002/kin.21241). The team, led by associate researcher Tang Xiaofeng, further advanced the vacuum ultraviolet photoionization mass spectrometry technology through an innovative ionizer design. Combined with a self-developed high-resolution, high-sensitivity small-reflection time-of-flight mass spectrometer, they achieved highly sensitive detection of free radicals in flow systems, reaching international standards. By using synchrotron radiation as the ionization source, they successfully performed full-scale detection of free radical reaction species and effectively distinguished isomers using photoionization efficiency spectra. Reviewers and editors of the *International Journal of Chemical Kinetics* expressed great interest in the research, noting that "highly sensitive free radical detection is very beneficial for studying reaction kinetics in the atmosphere and combustion chemistry." The detection limit was lowered to about 0.8 parts per billion, which is essential for analyzing low-density species like radicals in chemical kinetics experiments related to atmospheric and combustion chemistry. One reviewer remarked, "This is a very good start, and we expect more interesting work from the authors in the future." The research was supported by the National Key Research and Development Program, the National Natural Science Foundation, and the Chinese Academy of Sciences' International Cooperation Key Project. (Original title: Anguang's vacuum ultraviolet photoionization mass spectrometry technology and application research has made important progress)

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