J. Phys. IV France 03 (1993) C4-17-C4-27
Positron reactions with SF6 in hexane studied by measurements of the Doppler broadening of the annihilation lineO.E. MOGENSEN and T. HIRADE
Chemistry Department, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken 319-11, Japan
The Doppler broadening (DB) of annihilation radiation spectra were measured for solutions of SF6 in hexane at SF6 concentrations up to 1 M. By use of a new program GAUSSFIT the DB-spectra were analyzed in terms of a sum of the resolution-convoluted angular correlation spectrum for hexane and one or more extra, gaussians. Positron annihilation with electrons bound in fluorine gives an unusually broad DB-component. This effect was used to show that the positron reacts with SF6 in hexane with a rate constant of 2.3x1010 M-1s-1. The result agrees with previous predictions based on positronium yield results and the spur model of Ps formation.
© EDP Sciences 1993