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Surface‐enhanced resonant Raman scattering (SERRS) spectra of Rhodamine 6G (R6G) were acquired from single (aggregated) Ag colloidal particles that had been incubated with various amounts of R6G (0.1–125 nM). The spectra were investigated in detail and the evidence for a single‐molecule‐like response was found even for R6G:Ag particle ratios greatly exceeding equimolarity. After a thorough comparison with literature data, it is concluded that it is reasonable to expect a single‐molecule‐like response even for fairly ‘high’ R6G concentrations. A series of Raman images are shown and commented on with respect to bulk SERRS measurements. The problem of band assignment of single‐molecule spectra of biological species is addressed.
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Šašić et al. (2005) studied this question.
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