Abstract
When dissolved in higher than 1-P viscosity solvent, photoexcited malachite green (MG) like other triphenylmethane dyes is known to present a double exponential decay,1,2 while in low-viscosity solvent (like water) the question of one or several relaxation times remains open. Up to now, direct measurements3 may have been not accurate enough to solve this problem, but recently a frequency-domain experiment4 provided results consistent with either the sum of two decaying exponentials or with a uniform range of exponentials. However, this technique needs a deconvolution procedure and is limited to the spectral absorption region.
© 1984 Optical Society of America
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