Quantum-state-resolved insertion reaction: O(¹D) + H₂(J=0) → OH(²P, v, N) + H(²S)
量子態解析的插入型反應： O(¹D) + H₂(J=0) ® OH(²P, v, N) + H(²S)

Xianghong Liu, Jim J. Lin, Steven A. Harich, George C. Schatz and Xueming Yang
Science 289, 1536 (2000)

The O(¹D)+H₂ → OH+H reaction, which proceeds mainly as an insertion reaction at a collisional energy of 1.3 kilocalories per mole, has been investigated with the high-resolution H atom Rydberg "tagging" time-of-flight technique and the quasiclassical trajectory (QCT) method. Quantum state-resolved differential cross sections were measured for this prototype reaction. Different rotationally-vibrationally excited OH products have markedly different angular distributions, whereas the total reaction products are roughly forward and backward symmetric.  Theoretical results obtained from QCT calculations indicate that this reaction is dominated by the insertion mechanism, with a small contribution from the collinear abstraction mechanism through quantum tunneling.

我們應用高解析度H原子雷得堡標誌(Rydberg tagging)飛行時間質譜的方法，測得O(¹D) + H₂反應產物的量子態解析散射角分佈。雖總產物的角分佈顯現出前向-後向對稱，但對個別量子態則無此現象。比較古典軌跡(Quasi-Classical Trajectory)的計算結果顯示，此碰撞反應是經由插入(insertion) (即經過水分子H₂O形式的中間態)的途徑，僅少數部分經由量子穿隧進行擷取(abstraction)途徑。