Excitation of Molecular Vibrations by Positron Impact
- 19 February 2001
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 86 (8) , 1494-1497
- https://doi.org/10.1103/physrevlett.86.1494
Abstract
Absolute cross sections for the vibrational excitation of CO, CO2, and H2 by positron impact are presented for incident positron energies from 0.5 eV to several electron volts. The measurements use a novel technique that exploits the adiabatic motion of a positron beam in a strong magnetic field. This work is the first systematic experimental study of vibrational excitation by positron impact, and extends to energies where positron measurements have traditionally been difficult. The measured cross sections are compared with available theoretical calculations.Keywords
This publication has 20 references indexed in Scilit:
- Thermalization times of positrons in molecular gasesJournal of Physics B: Atomic, Molecular and Optical Physics, 2000
- Vibrational excitation by positron collisions with molecular gases: a study of O $\mathsf{_2}$ and NO targetsThe European Physical Journal D, 1999
- Collisions involving antiparticlesPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 1999
- Mode Dependence in Vibrational Excitation of aMolecule by Electron and Positron ImpactsPhysical Review Letters, 1998
- Positron scattering from polar molecules: Rotovibrationally inelastic collisions with CO targetsPhysical Review A, 1997
- Dynamical coupling effects in the vibrational excitation ofsandscolliding with positronsPhysical Review A, 1997
- Total cross sections for low and intermediate energy positrons and electrons colliding with CH4, C2H4and C2H6moleculesJournal of Physics B: Atomic and Molecular Physics, 1986
- Vibrational excitation of ν '=1 and 2 levels of CO molecules by positron impact below the positronium formation thresholdJournal of Physics B: Atomic and Molecular Physics, 1986
- Rovibrational excitation of the hydrogen molecule by low-energy positron impactJournal of Physics B: Atomic and Molecular Physics, 1985
- Collisions entre un positron et une molécule d'hydrogène avec excitation de vibrationsJournal de Physique Lettres, 1974