Abstract
The positronium formation was investigated as a function of a static electric field in various polymers. With increasing field strength the Ps relative yield at first declines, passes through a minimum which can be very flat, then rises rapidly, exceeds unity and approaches the saturation value. The experimental results can be well framed by a compound model which assumes that Ps formation occurs partly in the Ore gap and partly in the positron spur. This model enabled us to obtain mean values of the rates for positron elastic scattering and energy loss and for Ps formation above the threshold energy. The relative contribution of the two processes to Ps formation at zero field is also obtained together with the mean distance between positron and electron in the spur.
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