title: Observation of Feshbach resonances in the F + H2 --> HF + H reaction.
abstract: Reaction resonances, or transiently stabilized transition-state structures, have proven highly challenging to capture experimentally. Here, we used the highly sensitive H atom Rydberg tagging time-of-flight method to conduct a crossed molecular beam scattering study of the F + H2 --> HF + H reaction with full quantum-state resolution. Pronounced forward-scattered HF products in the v' = 2 vibrational state were clearly observed at a collision energy of 0.52 kcal/mol; this was attributed to both the ground and the first excited Feshbach resonances trapped in the peculiar HF(v' = 3)-H' vibrationally adiabatic potential, with substantial enhancement by constructive interference between the two resonances.
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China.
authors.forename: Minghui
authors.initials: M
authors.lastname: Qiu
authors.forename: Zefeng
authors.initials: Z
authors.lastname: Ren
authors.forename: Li
authors.initials: L
authors.lastname: Che
authors.forename: Dongxu
authors.initials: D
authors.lastname: Dai
authors.forename: Steve A
authors.initials: SA
authors.lastname: Harich
authors.forename: Xiuyan
authors.initials: X
authors.lastname: Wang
authors.forename: Xueming
authors.initials: X
authors.lastname: Yang
authors.forename: Chuanxiu
authors.initials: C
authors.lastname: Xu
authors.forename: Daiqian
authors.initials: D
authors.lastname: Xie
authors.forename: Magnus
authors.initials: M
authors.lastname: Gustafsson
authors.forename: Rex T
authors.initials: RT
authors.lastname: Skodje
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Sun
authors.forename: Dong H
authors.initials: DH
authors.lastname: Zhang
mesh_terms: D004583:Electrons; D005461:Fluorine / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D008956:Models, Chemical
chemical_list: D005461:Fluorine; D006859:Hydrogen