Photoacoustic spectral characteristics of Rh6G and RhB dye solutions in mixtures and on Al(2)O(3) surfaces.
Photoacoustic spectral characteristics of Rh6G and RhB solutions in mixtures and on Al(2)O(3) surfaces are reported. An enhancement of the photoacoustic signal is observed for dye mixtures, between 480 and 530 nm. This could be due to the dominance of the resonance excitation transfer process. In addition, the spectra of the mixtures show a blue shift due to dimer formation in Rh6G. Compared with those, the spectra of Rh6G and RhB on Al(2)O(3) surfaces show red shifts which may be due to photobleaching.
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