| Popis: |
Fluorescence spectra of β-carotene in ethanol measured in a temperature range from liquid to solid phases of solvent are compared with a model calculation, assuming a linear electron-phonon interaction with a phonon density of states weighted by coupling constant, ϱ(ω) ∝ ωe − ω ω p . We obtain a peak phonon energy ωp = 28 cm−1, a lattice relaxation energy ELR = 210 cm−1 and temperature dependences of amplitude of the energy modulation and inhomogeneous width. The ratio E LR ω P ∼- 8 shows that the electron -phonon interaction is near the strong coupling regime in this system. |
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