Abstract
The purpose of this paper is to review the progress in positron–gas cross-section measurements. Total cross-section measurements for 0.3–1000 eV e+–He, Ne, Ar, Kr, Xe, H2, N2, CO2, O2, CH4, and CO are summarized. Interesting shape features in the total cross-section curves, such as Ramsauer–Townsend effects and the onsets of positronium formation are discussed. An effort is made to compare total cross-section measurements from different laboratories to see if there are any consistencies which could provide information on the reliability of the various measurements. Comparisons of total cross-section measurements for positrons and electrons colliding with several of the above gases are presented in an attempt to illustrate the similarities and differences between positron and electron scattering. Some recent positron cross-section investigations pertaining to differential scattering, positronium formation, inelastic scattering, atomic excitation, and resonance searches are also discussed.
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