S. Zhou et al., MEASUREMENTS OF TOTAL CROSS-SECTIONS FOR POSITRONS AND ELECTRONS COLLIDING WITH ATOMIC-HYDROGEN, Hyperfine interactions, 89(1-4), 1994, pp. 483-487
We have measured total cross sections for 5-302 eV positrons and 31-30
2 eV electrons scattered by atomic hydrogen using a beam-transmission
technique. Atomic hydrogen obtained from a radio frequency (rf) discha
rge source flows into an aluminium scattering cell maintained at about
150 K to minimize recombination. Absolute total cross sections are ob
tained by making relative measurements for positrons and electrons sca
ttering from Hz and a known mixture of H and Hz, and then normalizing
the measurements for positron-H-2 scattering to prior absolute measure
ments. Our total cross section measurements for positrons and electron
s scattering from H are found to be merged to within 5% for energies f
rom 31 to 302 eV.