title: Positron annihilation in molecules 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 CH3F, CH3Cl, and CH3Br [L. D. Barnes, Phys. Rev. A 74, 012706 (2006)10.1103/PhysRevA.74.012706] shows good agreement and yields estimates of the binding energies.
authors.affiliation: Department of Applied Mathematics and Theoretical Physics, Queen's University, Belfast BT7 1NN, Northern Ireland, United Kingdom. g.gribakin@am.qub.ac.uk
authors.forename: G F
authors.initials: GF
authors.lastname: Gribakin
authors.forename: C M R
authors.initials: CM
authors.lastname: Lee