Use of cassegrain system for in situ Raman scattering study of cyanide ions on a palladium electrode

Abstract

The nonenhanced Raman scattering spectra from CN- ions adsorbed at the electrolyte/Pd electrode interface has been obtained with the use of a combination of a Cassegrain lens and a multichannel detector. Previously reported FT-IR spectra under similar conditions were used to help interpret the Raman-scattering results. The scattering results are explained on the basis of five bands assigned to the CN stretches. The position of these bands at 1950, 2060, 2090, 2150, and 2220 cm-1 are assigned to the covalent bond to a bridge site, covalent bond to an atop site, and ionic bond to Pd, Pd(CN) 42-, and Pd(CN)2. This study shows that it is possible to obtain an enhancement of about 10′ by use of the Cassegrain system described here. © 1993 Society for Applied Spectroscopy.