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KINETIC ISOTOPE EFFECTS IN GAS-PHASE MUONIUM REACTIONS

TitleKINETIC ISOTOPE EFFECTS IN GAS-PHASE MUONIUM REACTIONS
Publication TypeJournal Article
Year of Publication1992
AuthorsBaer, S, Fleming, DG, Arseneau, D, Senba, M, Gonzalez, A
JournalAcs Symposium Series
Volume502
Pagination111-137
Type of ArticleReview
ISBN Number0097-6156
Keywords+ HBR(DBR) ABSTRACTION, ACTION, ADDITION-REACTIONS, CALCULATIONS, CHARGE-EXCHANGE, COLLISIONS, LOW-TEMPERATURES, POTENTIAL-ENERGY SURFACES, PRESSURE-DEPENDENCE, RESONANCE, THERMAL RATE CONSTANTS, TRANSITION-STATE THEORY, TUNNELING PATHS
Abstract

The study of the reaction dynamics of muonium (Mu), an ultralight isotope of hydrogen ((m)Mu/(m)H almost-equal-to 1/9), provides a sensitive measure of mass effects in chemical reactions. The remarkable mass difference between Mu and the other hydrogen isotopes produces large kinetic isotope effects, providing a rigorous test of calculated potential energy surfaces (PES) and reaction rate theories. The low Mu mass also necessitates careful consideration of quantum effects, i.e. tunneling in the reaction coordinate. A review of recent results in gas phase Mu chemistry is presented, including comparison with relevant H chemistry and calculated PESs, where available. The magnitude and direction of the kinetic isotope effect is shown to be a sensitive function of the PES, particularly the height and position of the saddle point.

URL<Go to ISI>://A1992JY55000008