Abstract
Abstract Measurements of free positron lifetimes and positronium formation fractions have been taken for CO2 and SF6 in the temperature range 273–350 K. The free positron lifetimes behave in a similar fashion to observations in other gases close to their critical temperatures and is interpreted as being due to the formation of molecular cluster around the positrons prior to annihilation. The Ps fractions are compared to a recently proposed semi-empirical model of Ps formation which includes contributions from Ore and spur model processes. The observed features of the Ps fraction curves are qualitatively reproduced by the model.
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