With the support of the National Natural Science Foundation of China (Project Grant No. 20688301, 20833007, 21321091), etc., researchers Xiao Chunlei, Sun Zhigang, Yang Xueming, Zhang Donghui, etc. of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences Groundbreaking progress has been made in the research of the state of the arts, and their paper Dynamic Resonances Accessible Only by Reagent Vibrational Excitation in the F + HD → HF + D Reaction (F + HD → HF + D) was published in Science on December 20 In the magazine (Science. 2013, 342, 1499-1502).
Molecular vibration has an extremely important influence on chemical reactions, and has long been one of the frontiers in the field of molecular reaction dynamics. H2 and its isotope molecules are the most widely studied molecules in the field of molecular reaction dynamics. In the past two or three decades, the research on reactions such as H / D / F / O / Cl / OH + H2 / HD / D2 has greatly promoted the development of reaction kinetics and greatly improved our Understanding of the mechanism. Unfortunately, H2 is a non-polar molecule, and its vibrational excited state can only be obtained by Raman excitation. Because the efficiency of Raman excitation is generally very low, the reaction kinetics of the excited state H2 has never been achieved in cross molecular beam experiments. The above-mentioned researchers have made outstanding progress in the efficient preparation of vibrationally excited molecules using Stark-induced adiabatic Raman Passage (SARP) technology through independent research and development of narrow linewidth OPO lasers. From (v = 0, j = 0) to HD molecules Excitation to (v = 1, j = 0) achieved an efficiency higher than 91% (J. Phys. Chem. Lett. 2013, 4, 368-371). On this basis, they have mastered the technology of using excited Raman excitation to efficiently prepare vibrationally excited hydrogen molecules in molecular beams, making it possible to study the dynamics of HD (v = 1) scattering in crossed molecular beams.
This work shows that for chemical reactions, molecular vibration excitation not only provides energy, but also opens new reaction channels, allowing us to observe resonance phenomena that cannot be observed in the ground state reaction, which improves our understanding of the essential mechanism of chemical reactions Recognition is very important.
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