| Abstract
| - The analysis of single molecules instead of a molecular ensemble provides a more detailed insight into molecularstates and environment. Surface- and also tip-enhanced (resonance) Raman spectroscopy are becoming aninteresting alternative to, in this respect, commonly employed fluorescence spectroscopy because of the muchricher spectral information that is obtained from unmodified, label-free species. However, sometimes it isdifficult to distinguish between the target molecule and contamination or decomposition of the sample, andunfortunately, it is not always ensured that the observed Raman features actually stem from the investigatedspecies. The important question that arises in enhanced Raman studies addressed here is how to distinguishbetween the target molecule and the carbonaceous species.
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