Total and differential scattering cross section measurements for positrons and electrons colliding with inert gases. [eV range]

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5421263

Dababneh, M S

Total scattering cross sections have been measured in the same apparatus for low and intermediate energy positrons and electrons colliding with krypton and xenon using a beam transmission technique. The low energy positron measurements reveal a sudden increase in the cross sections in the vicinity of 7 eV and 5 eV for krypton and xenon, respectively, which correspond to the positronium formation thresholds. The intermediate energy positron- and electron-krypton measurements show a continuous decrease in the two cross sections from the maxima at about 10 eV and 30 eV for electrons and positrons, respectively. There is an indication of a gradual approach of the electron and positron scattering cross section at higher energies. The intermediate energy positron- and electron-xenon measurements show a continuous decrease in the cross sections above 40 eV and 10 eV, respectively. A sharper decrease has been observed for electron-xenon scattering measurement where the cross sections drop below the positron scattering cross sections between 40 eV and 90 eV. The two curves diverge above 100 eV and seem to be converging again at about 500 eV. Experimental apparatus has been constructed for measuring differential scattering cross sections from 15/sup 0/ to 150/sup 0/ for positrons and electrons colliding with atoms and molecules. Preliminary differential scattering cross section measurements at 90/sup 0/ have been made for low energy electrons colliding with helium and argon. The electron-helium measurements show a continuous decrease in the cross section with energy. The electron-argon measurements show a peak in the cross section in the vicinity of 5 eV and a slow decrease in the cross section above 8 eV.

• Research Organization: Wayne State Univ., Detroit, MI (USA)
• OSTI ID: 5421263
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY RANGE
EV RANGE
FLUIDS
GASES
HELIUM
KRYPTON
MOLECULE COLLISIONS
NONMETALS
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
POSITRON-MOLECULE COLLISIONS
POSITRONIUM
RARE GASES
SCATTERING
XENON