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Science 13 June 2003:
Vol. 300. no. 5626, pp. 1730 - 1734
DOI: 10.1126/science.1084041
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Reports

Interference of Quantized Transition-State Pathways in the H + D2 -> D + HD Chemical Reaction

Dongxu Dai,1 Chia C. Wang,2,3 Steven A. Harich,1,2 Xiuyan Wang,1 Xueming Yang,1,2,4* Sheng Der Chao,5 Rex T. Skodje5*

The collision-energy dependence of the state-resolved differential cross section at a specific backward-scattering angle for the reaction H + D2 -> D + HD is measured with the D-atom Rydberg "tagging" time-of-flight technique. The reaction was modeled theoretically with converged quantum scattering calculations that provided physical interpretation of the observations. Oscillations in the differential cross sections in the backward-scattering direction are clearly observed and are attributed to the transition-state structures that originate from the interferences of different quantized transition-state pathways.

1 State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.
2 Institute of Atomic and Molecular Sciences, Academia Sinica, Post Office Box 23166, Taipei, Taiwan.
3 Department of Chemistry, National Taiwan University, Taipei, Taiwan.
4 Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan.
5 Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA.

* To whom correspondence should be addressed. E-mail: xmyang{at}po.iams.sinica.edu.tw (X.Y.), skodje{at}spot.colorado.edu (R.T.S.)

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