Abstract
Experimental values of o-Ps lifetime were compared with model calculations, approximating the voids in a solid by spheres or cuboids. In the case of resorcinol the model of spherical voids is well consistent with the experimental data. For channel-like free volumes the formula, analogous to that for spheres, gives systematically the values of o-Ps lifetime too large. No positronium is found in anthracene, although the radius of free volume is larger than 0.97 Å at which the Ps binding energy should be zero.
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Jasińska, B., Kozioł, A.E. & Goworek, T. Ortho-positronium lifetimes in nonspherical voids. Journal of Radioanalytical and Nuclear Chemistry, Articles 210, 617–623 (1996). https://doi.org/10.1007/BF02056403
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DOI: https://doi.org/10.1007/BF02056403