Interference of Quantized Transition-State Pathways in the H + D₂ à D + HD Chemical Reaction
在 H + D₂ ® D + HD 的反應中，量子化過渡態路徑的干涉行為

Dongxu Dai, Chia C. Wang, Steven A. Harich, Xiuyan Wang, Xueming Yang, Sheng Der Chao, Rex T. Skodje
Science 300, 1730 (2003)

The collision-energy dependence of the state-resolved differential cross section at a specific backward-scattering angle for the reaction H + D₂ à 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.

我們利用交叉分子束暨D原子雷德堡標誌(Rydberg tagging) 的方法，從高解析度的產物飛行時間質譜，得到HD產物的振動和轉動能階的分佈。分析產物訊號與碰撞能量的關係曲線圖，證實了反應的特殊震盪現象，經由量子化學計算得知，此震盪可歸因於過渡態上數個反應路徑間的量子干涉行為。