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Science 14 October 1994:
Vol. 266. no. 5183, pp. 259 - 261
DOI: 10.1126/science.266.5183.259
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Articles

Partial Control of an Ion-Molecule Reaction by Selection of the Internal Motion of the Polyatomic Reagent Ion

Robert D. Guettler 1, Glenn C. Jones Jr. 1, Lynmarie A. Posey 1, and Richard N. Zare 1

1 Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.

The ion-molecule reaction NH3+ + ND3 has been studied at various collision energies (1 to 5 electron volts in the center of mass) with preparation of the NH3+ reagent in two nearly isoenergetic vibrational states. One state corresponds to pure out-of-plane bending of the planar NH3+ ion (0.60 electron volts), whereas the other state is a combination of in-plane and out-of-plane motion (0.63 electron volts). The product branching ratios differ markedly for these two vibrational-state preparations. The differences in reactivity suggest that the in-plane totally symmetric stretching mode is essentially inactive in controlling the branching ratio of this reaction.

Submitted on June 24, 1994
Accepted on August 2, 1994


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Laser Control of Chemical Reactions.
R. N. Zare (1998)
Science 279, 1875-1879
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Science. ISSN 0036-8075 (print), 1095-9203 (online)