Positron-impact ionization of atomic hydrogen

Conference · Fri Jun 01 04:00:00 EDT 1990 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6397976

Raith, W; Olsson, B; Sinapius, G; Sperber, W; Spicher, G ^[1]

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1. Fakulta fuer Physik, Universitaet Bielefeld, D-4800 Bielefeld (Federal Republic of Germany)

In a crossed-beam experiment the impact-ionization cross section, integrated over all angles and energy partitions but excluding positronium formation, has been measured for positrons as well as electrons in the energy region of 30 to 600 eV. Below 400 eV the positron cross section is larger than the electron one, at 40 eV by about a factor of 2. Absolute cross sections are obtained by comparing the electron data with literature values. Our cross sections for positron-impact ionization lie above all theoretical predictions; within the errors they barely agree with the distorted-wave polarized-orbital calculations of Ghosh {ital et} {ital al}. for the model in which the scattered positron is described by a plane wave.

• OSTI ID: 6397976
• Report Number(s): CONF-890708--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Journal Volume: 205:1
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
DATA
ELEMENTS
ENERGY RANGE
EV RANGE
EXPERIMENTAL DATA
HYDROGEN
INFORMATION
IONIZATION
NONMETALS
NUMERICAL DATA
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS