Positron-molecule annihilation by capture into vibrational Feshbach resonances of infrared-active modes
G. F. Gribakin, C. M. R. Lee
Abstract
Enhanced positron annihilation on polyatomic molecules is a long-standing and complex problem. We report the results of calculations of resonant positron annihilation on methyl halides. A free parameter of our theory is the positron binding energy. A comparison with energy-resolved annihilation rates measured for CH3F, CH3Cl, CH3Br [Barnes et al. Phys. Rev. A 74, 012706 (2006)] shows good agreement and yields estimates of the binding energies.
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