Anomalous behavior of the fluorescence spectra of perylene in n-octane under pressure and temperature variations

Pressure-induced transformations of the vibronic spectra of perylene in n-o ctane were studied. An increase in pressure from normal to 10 kbar caused a sharp change in the multiplet structure of the spectra. An anomalous, almo st linear temperature dependence of spectral line widths was observed in th e temperature range 4.2-15 K. Both temperature and baric effects were expla ined in terms of the same model of a two-well adiabatic potential of impuri ty centers, which caused the appearance of low-frequency splittings in the ground and excited electronic level regions. (C) 2001 MAIK "Nauka/Interperi odica".