Abstract
Emission of positronium (Ps) from thin Ag(100) foils (1500-1900 AA) has been studied in reflection and transmission geometries. Positron transmission probabilities of the 1900 AA foil have been extracted from the data and fitted to give an effective positron diffusion length of 425-475 AA. Furthermore, the one-dimensional velocity distribution perpendicular to the foil surface has been estimated to be non-Maxwellian. The conversion efficiency of incident positrons to Ps in transmission is estimated to be approximately 12% for a 1900 AA foil at 800 K.
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