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Science 1 September 2000:
Vol. 289. no. 5484, pp. 1536 - 1538
DOI: 10.1126/science.289.5484.1536
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Reports

A Quantum State-Resolved Insertion Reaction: O(1D) + H2(J = 0) → OH(2∏, v, N) + H(2S)

Xianghong Liu,1 Jim J. Lin,1 Steven Harich,1 George C. Schatz,2 Xueming Yang13*

The O(1D) + H2 rightarrow  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.

1 Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan, ROC.
2 Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
3 Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan, Republic of China.
*   To whom correspondence should be addressed. E-mail: xmyang{at}po.iams.sinica.edu.tw

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