Figure 7. Potential dependent SERS Raman spectra of K3[Fe(CN)6]. Left: low frequency region, right: high frequency region

From

Combining Optical and Raman Spectroscopy with Electrochemistry: The Ferricyanide and Ferrocyanide System - Experiments for Undergraduates

A. Habekost

World Journal of Chemical Education. 2024, 12(1), 30-38 doi:10.12691/wjce-12-1-5