Effect of temperature on the formation of a bound-state of positronium with nitrobenzene and on the related hyperfine interaction parameters

Billard, I.; Abbé, J. Ch.; Duplâtre, G.
July 1992
Journal of Chemical Physics;7/15/1992, Vol. 97 Issue 2, p1548
Academic Journal
The strong magnetic field effect on the chemical bound-state formation of positronium with nitrobenzene in n-hexane previously studied at 294 K has been further examined as a function of temperature, from 264 to 328 K. The model proposed before to explain the data, implying the definition of triplet and singlet positronium bound-state, appears to be valid at all temperatures studied. The variation with temperature of the parameters descriptive of the bound-state are derived; the hyperfine splitting is constant at 1.06×10-5 eV, while the contact density parameter, ηc, shows an abrupt change from 0.43 to 1.56 between 286 and 292 K. These experiments give new insight on the structure of the bound-state formed, which may be considered as a charge-transfer complex.


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