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Science 10 March 2006:
Vol. 311. no. 5766, pp. 1440 - 1443
DOI: 10.1126/science.1123452
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Reports

Observation of Feshbach Resonances in the F + H2 -> HF + H Reaction

Minghui Qiu,1,3* Zefeng Ren,1* Li Che,1 Dongxu Dai,1 Steve A. Harich,1 Xiuyan Wang,1 Xueming Yang,1{dagger} Chuanxiu Xu,4 Daiqian Xie,4{dagger} Magnus Gustafsson,5,6 Rex T. Skodje,5,6 Zhigang Sun,1,2,7 Dong H. Zhang1,2,7{dagger}

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.

1 State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China.
2 Center for Theoretical and Computational Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China.
3 Department of Physics, Dalian Jiaotong University, Dalian, P. R. China.
4 Institute of Theoretical and Computational Chemistry, Department of Chemistry, Nanjing University, Nanjing, Jiangsu 210093, P. R. China.
5 Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei, Taiwan.
6 Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA.
7 Department of Computational Science, National University of Singapore, Singapore 119260.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: xmyang{at}dicp.ac.cn, dqxie{at}nju.edu.cn, zhangdh{at}dicp.ac.cn

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