Positron-molecule annihilation by capture into vibrational Feshbach resonances of infrared-active modes

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 CH${}_3$F, CH${}_3$Cl, CH${}_3$Br [Barnes et al. Phys. Rev. A {\bf 74}, 012706 (2006)] shows good agreement and yields estimates of the binding energies.

4 pages, 2 figures

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