Title

The Analysis of Muonium Hyperfine Interaction Measurements of Thermal Rate Constants for Addition Reactions

Document Type

Article

Publication Date

1991

Publication Source

Journal of Chemical Physics

Volume

94

Inclusive pages

2794

ISBN/ISSN

The Analysis of Muonium Hyperfine Interaction Measurements of Thermal Rate Constants for Addition Reactions

Peer Reviewed

yes

Abstract

A new model is developed for the analysis of muon spin relaxation (mu-SR) measurements of muonium (Mu) reaction rates with other chemical species. The kinetics component of the model is specifically developed for addition reactions but can be extended to direct reactions. The polarization component of the model assumes that the adduct formed possesses a single, effective spin precession frequency. The complete model is solved to obtain an analytic expression for the mu-SR signal as a function of time. Both a time-ordered sequence method and a Boltzmann spin equation method give equivalent solutions. These solutions are analyzed under various kinetic conditions. It is concluded that the coefficient controlling the decay of the mu-SR signal is closely related to the adduct formation rate constant, i.e., the high pressure limit of the apparent bimolecular addition rate constant. In the most favorable case, the decay constant gives the adduct formation rate constant directly at all pressures of buffer gas.

Keywords

CHARGE-EXCHANGE COLLISIONS, COMPETING PROCESSES, DEPENDENCE, HYDROGEN, KINETIC-EQUATIONS, LOW-PRESSURE GASES, MOLECULAR ION, radicals, SPIN-EXCHANGE, TEMPERATURE-RANGE

Disciplines

Chemistry

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