Spectral Hole Burning in Doped Organic Crystals and Polymer Glasses under Hydrostatic Pressure

摘要

We give an overview of results obtained in our isobaric studies of spectral holes in chlorin-doped glassy polystyrene, frozen n-octane and crystalline p-terphenyl under various fixed pressures up to 8.4 kbar at 4.2-18K. Some results on low-pressure (< 0.1 kbar) tuning of spectral holes at 1.5-4.2 K in benzophenone, biphenyl and frozen n-octane doped with chlorin and in frozen n-hexane doped with dimethyl-s-tetrazine are also described along with a theoretical work on the pressure effects in such nonisobdric studies. The most interesting effect, observed in our high-pressure isobaric experiments and explained theoretically, is the pressure-induced narrowing of spectral holes in glassy polystyrene, caused mainly by reduction in the number of soft localized modes in a glass under pressure.