Observation of Feshbach resonances in the F + H2 --> HF + H reaction.
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.
Qiu
Minghui
M
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China.
Ren
Zefeng
Z
Che
Li
L
Dai
Dongxu
D
Harich
Steve A
SA
Wang
Xiuyan
X
Yang
Xueming
X
Xu
Chuanxiu
C
Xie
Daiqian
D
Gustafsson
Magnus
M
Skodje
Rex T
RT
Sun
Zhigang
Z
Zhang
Dong H
DH
D004583:Electrons; D005461:Fluorine / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D008956:Models, Chemical
D005461:Fluorine; D006859:Hydrogen