Tip enhanced Raman spectroscopy (TERS) and imaging experiments in tunnelling (gap) mode were performed on a 2 nm thick azobenzene thiol monolayer grafted on Au(111). A strong dependence on the tunnelling parameters, regulating the gold tip–gold surface gap distance, was observed for the intensity of the enhanced Raman signal. The influence of the incident light polarization is also discussed.
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Picardi et al. (2009) studied this question.
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