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Free keywords:
Tip enhancement; Near-field enhancement; Surface enhancement; Raman spectroscopy; Scanning tunneling microscopy (STM); Cyanide adsorption; SERS; TERS
Abstract:
Combined surface- and tip-enhanced Raman spectroscopy (SERS and TERS, respectively) experiments for CN– adsorbed at Au-surfaces are presented. STM tip-induced frequency shifts for the CN-stretch vibration are observed. This effect is attributed to a distinct weighting of the individual contributions to TERS, depending on the particular field distribution, which peaks underneath the tip apex and drops quickly beyond this region.