Abstract
The lifetime spectra of positrons in solid chrysene were measured at temperatures of 160–300 K. The temperature dependence of positronium yield suggests Ps trapping on thermally produced free volumes. Those volumes cannot be vacancies, but rather the intermolecular free spaces; thermal motions of molecules can increase these spaces to the extent making Ps creation energetically possible.
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Goworek, T., Rybka, C. Positronium formation in chrysene. J Radioanal Nucl Chem 242, 225–226 (1999). https://doi.org/10.1007/BF02345925
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DOI: https://doi.org/10.1007/BF02345925