USE OF CASSEGRAIN SYSTEM FOR IN-SITU RAMAN-SCATTERING STUDY OF CYANIDE IONS ON A PALLADIUM ELECTRODE

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. Previou sly reported FT-IR spectra under similar conditions were used to help interpret the Raman-scattering results. The scattering results are exp lained on the basis of five bands assigned to the CN stretches. The po sition of these bands at 1950, 2060, 2090, 2150, and 2220 cm-1 are ass igned 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 t hat it is possible to obtain an enhancement of about 10(3) by use of t he Cassegrain system described here.