Spectroscopic analysis reveals polarized optical constants and Davydov splitting in pyrene crystals at variable temperatures, highlighting electronic shifts across phase transitions.
Reflectance spectra of pyrene have been measured on the a b plane of single crystals at 300 and 77 K. Refractive indices, complex dielectric constants and absorption coefficients are calculated for the a - and b -polarized components by Kramers-Kronig analysis of the reflectance spectra. Brief discussions on the Davydov splitting, vibrational levels, polarization ratios and the spectral change due to the phase transition are given.
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Tomioka et al. (1981) studied this question.
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