Abstract
Site-selected fluorescence spectra have been measured for dye molecules doped in polymer films at low temperatures under the excitation by a cw mode-locked dye laser. A time-correlated single-photon counting method has been employed for the detection. It has been found possible to obtain the resonance fluorescence spectrum by rejecting the scattered laser light using a time gate much after the termination of the exciting pulse. The distribution of the site energy in the sample has been determined from the excitation spectrum for the resonance fluorescence. The fluorescence. It is concluded that large deviation from the mirror sysmmetry relation is present between the single-site absorption and fluorescence spectra.
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