We observed change of surface-enhanced resonance Raman scattering (SERRS) spectra of thiacyanine molecules adsorbed on a single Ag nano-aggregate. In water, the SERRS spectrum with background emission changes to temporally-fluctuated spectra without background emission. It seems that the change coincides with dissolution of thiacyanine J-aggregate into the monomers or the dimers.
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Kitahama et al. (2008) studied this question.