Other
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3058...13s&link_type=abstract
In NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies, NASA CP-3058 p 13-27 (SEE N90-18957 11-70)
Other
Alkali Metals, Atomic Collisions, Electron Scattering, Positrons, Scattering Cross Sections, Atomic Energy Levels, Polarization (Waves), Positron Annihilation, Potassium, Sodium, Targets
Scientific paper
Absolute total scattering cross sections (Q sub T's) were measured for positrons and electrons colliding with sodium, potassium, and rubidium in the 1 to 102 eV range, using the same apparatus and experimental approach (a beam transmission technique) for both projectiles. The present results for positron-sodium and -rubidium collisions represent the first Q sub T measurements reported for these collision systems. Features which distinguish the present comparisons between positron- and electron-alkali atom Q sub T's from those for other atoms and molecules (room-temperature gases) which have been used as targets for positrons and electrons are the proximity of the corresponding positron- and electron-alkali atom Q sub T's over the entire energy range of overlap, with an indication of a merging or near-merging of the corresponding positron and electron Q sub T's near (and above) the relatively low energy of about 40 eV, and a general tendency for the positron-alkali atom Q sub T's to be higher than the corresponding electron values as the projectile energy is decreased below about 40 eV.
Dababneh M. S.
Kauppila W. E.
Kwan Chi-Keung
Lukaszew R. A.
Parikh S. P.
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