Reaction Pathway Control via Reactant Vibrational Excitation and Impact on Product Vibrational Distributions: The O + HO 2 → OH + O 2 Atmospheric Reaction.
Qixin ChenShuwen ZhangXixi HuDai-Qian XieHua GuoPublished in: The journal of physical chemistry letters (2022)
Chemical reactions often have multiple pathways, the control of which is of fundamental and practical importance. In this Letter, we examine the dynamics of the O + HO 2 → OH + O 2 reaction, which plays an important role in atmospheric chemistry, using quasi-classical trajectories on a recently developed full-dimensional potential energy surface (PES). This reaction has two pathways leading to the same products: the H abstraction pathway (O a + HO b O c → O a H + O b O c ) and the O abstraction pathway (O a + HO b O c → O b H + O a O c ). Under thermal conditions, the reaction is dominated by the latter channel, which is barrierless, leading to vibrational excitation of the O 2 product. However, we demonstrate that excitation of the HO 2 reactant in its O-H ( v 1 ) vibrational mode results in dramatic switching of the reaction pathway to the activated H abstraction channel, which leads to a highly excited OH product vibrational state distribution. The implications of such dynamical effects in the atmospheric chemistry are discussed.