Comparison of IR and SERS spectroscopy for investigation of catalytic reactions on cold-deposited Cu

Abstract

Infrared (IR) and surface-enhanced Raman spectroscopy (SERS) of similarly prepared samples show different results that cannot be explained by different selection Tules. One main difference is the missing of a signal ofNO in the SERS spectra, only reaction products like N, and N,O could be seen, whereas in IR clearly NO vibrations were detected. IR spectra were hken to investigate the influence of additional heat and additional photons during the measurement. Besides desorption, no influence like increase of the reaction products N2 or N20 could be found. It seems to us that a dishlrbance of the investigated system due to Laser irradiation during SERS is not the explanation for the different findings.