Temperature-dependent determination of NO dimerization reaction based on dual-comb spectroscopy.

Dimerization reactions play a critical role in various fields of research, including cell biology, biomedicine, and chemistry. In particular, the dimerization reaction of 2NO⇌NO has been extensively applied in pollution control and raw material preparation. Spectroscopy, as a powerful tool for investigating molecular structures and reaction kinetics, has been increasingly employed to study dimerization reactions in recent years. In this study, we successfully demonstrated the application of dual-comb spectroscopy (DCS) to analyze NO dimerization reactions, making the first report on the application of this technique in this context. Parallel measurements of NO and NO fingerprints spectra with high resolution at 3000 cm was performed, benefiting from the unprecedented broadband and high-precision capability of DCS. The absorption cross-sections of NO from 296 to 343 K was obtained from the measured spectra, which contributes to further research on the molecular spectrum of NO. These results demonstrate the potential of DCS for studying the dimerization reaction mechanism.