Total-cross-section measurements for positrons and electrons colliding with H2, N2, and CO2

Details Total-cross-section measurements for positrons and electrons colliding with H2, N2, and CO2 Total-cross-section measurements for positrons and electrons colliding with H2, N2, and CO2

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phrva..25.1393h&link_type=abstract

Physical Review A - General Physics, 3rd Series, vol. 25, Mar. 1982, p. 1393-1403.

Physics

General Physics

193

Carbon Dioxide, Electron Scattering, Hydrogen, Molecular Collisions, Nitrogen, Positrons, Scattering Cross Sections, Beam Interactions, Error Analysis, Particle Energy, Particle Interactions

Scientific paper

Total scattering cross sections have been measured in the same apparatus for positrons and electrons colliding with H2, N2, and CO2, using a beam transmission technique. The projectile impact energies range from 1-500 eV for e(+)-H2, 2-500 eV for e(-)-H2, 0.5-750 eV for e(+)-N2, 2.2-700 eV for e(-)-N2, 0.5-60 eV for e(+)-CO2, and 2-50 eV for e(-)-CO2. The onset of positronium formation is clearly seen by an abrupt rise in the total cross sections for positrons colliding with each of the molecules at the respective positronium-formation thresholds. The positron measurements are compared with the electron measurements at intermediate energies for H2 and N2. This comparison reveals a merging of the cross sections for H2 at energies above 200 eV, while for N2 the electron results remain higher than the positron results at all energies. Estimates are made of potential experimental errors, as well as the experimental resolution for discrimination against projectiles scattered at small forward angles.

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