Mode selectivity in ion–molecule reactions of NH3+ View Full Text


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Article Info

DATE

2000-11

AUTHORS

J.C. Poutsma, M.A. Everest, J.E. Flad, R.N. Zare

ABSTRACT

Ammonia ions (NH3+) are prepared in two internal states of nearly the same energy, a state with five quanta in the umbrella bending mode (Eint=0.60 eV) and another state with one quantum in the all-symmetric stretch and two quanta in the umbrella bending mode (Eint=0.63 eV). These ions are allowed to react with different neutral reagents, and the product ions are mass analyzed and detected. For each reaction, the product branching ratios are measured as a function of center-of-mass collision energy. Whereas reactions with D2O, D2, and CD4 are found to be uninfluenced by the state preparation of the NH3+ reagent, reactions with ND3, partially deuterated methylamine (CD3NH2), and tetrahydrofuran (c-(CH2)4O)show varying degrees of mode selectivity, the reaction with tetrahydrofuran to the least extent. We suggest that mode selectivity in these ion–molecule reactions should be a general feature when the charge transfer channel is energetically open, the geometry of the reagent ion differs markedly from the corresponding neutral, and different reaction pathways compete for product production. More... »

PAGES

623-625

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s003400000381

DOI

http://dx.doi.org/10.1007/s003400000381

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1024205500


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