Abstract
It was shown in the last chapter that laser excitation of inhomogeneous optical bands enables one to obtain well resolved FLN-vibronic spectra. However, it is not convenient to study the ZPL in fluorescence spectra because of the short lifetime of the allowed electronic transition. Fluorescence line narrowing is not the only method available for removing inhomogeneous broadening. There is another method of selective spectroscopy called spectral hole burning (SHB). The shape of the ZPL is studied by means of the SHB method [11,12, 84].
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