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NEAR-THRESHOLD EFFECTS IN POSITRON-ATOM (MOLECULE) SCATTERING

LARICCHIA, G; MOXOM, J; CHARLTON, M; KOVER, A; MEYERHOF, WE; (1994) NEAR-THRESHOLD EFFECTS IN POSITRON-ATOM (MOLECULE) SCATTERING. In: HYPERFINE INTERACTIONS. (pp. 209 - 218). BALTZER SCI PUBL BV

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Abstract

The energy dependence of the total cross-sections for ionization by positron impact has been measured for He, Ne, Ar, CO2 and O-2. The interplay between this and other scattering channels has been investigated. The data for He, Ne and Ar has been interpreted using a combination of R-matrix and threshold theories in the neighbourhood of the Ps formation threshold. In CO2, an enhancement of the Ps formation probability is found when the remnant ion is left in an excited state. In O-2, structure has been observed which indicates channel-coupling with excitation to the Schumann-Runge continuum.

Type:Proceedings paper
Title:NEAR-THRESHOLD EFFECTS IN POSITRON-ATOM (MOLECULE) SCATTERING
Event:Positron Workshop on Positron Interactions with Atoms, Molecules and Clusters
Location:BIELEFELD, GERMANY
Dates:1993-07-14 - 1993-07-16
Keywords:CROSS-SECTION MEASUREMENTS, IONIZATION, IMPACT, COLLISIONS, H-2, HE, AR, HELIUM
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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