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Electron scavenging by SF6in the positron spur in nonpolar liquids

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
65
Issue
3
Identifiers
DOI: 10.1016/0009-2614(79)80282-1

Abstract

Abstract The positronium (Ps) yield in mixtures of SF 6 with heptane, isoctane, neopentane, and a 0.05 M CCl 4/heptane solution has been determined by means of the lifetime technique. The Ps inhibition constant of SF 6 correlated well with the excess electron rate constant at low SF 6 concentrations. However, minima in the Ps yields were found ( I 3 ≈ 12% at 0.3–0.6 M SF 6 in the pure liquids) at higher SF 6 concentrations. The minima are explained in terms of electron delocalization on the SF 6 molecules resulting in increased probability of a positron SF − 6 reaction to form Ps at higher SF 6 concentrations.

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