Abstract
The zero-phonon line shapes of dye-surface systems which are distinctly non-Lorentzian are reported. The line shape for persistent spectral holes burnt into the Qx (0, 0) absorption band of octaethylporphyrin adsorbed on γ-alumina can be well approximated by a sum of two Lorentzians with the same center frequency and with widths differing by an order of magnitude (500 MHz and 5 GHz at 2.0 K). The temperature dependence of the widths of the Lorentzians was found to be linear. The results are discussed in the light of recent theoretical models.
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