Abstract
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 4.2–18 K. 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 non-isobaric 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.
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