Comparisons between Surface-Enhanced Raman and Surface Infrared Spectroscopies for Strongly Perturbed Adsorbates: Thiocyanate at Gold Electrodes.
UTAH UNIV SALT LAKE CITY DEPT OF CHEMISTRY
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The potential-dependent C-N stretching mode, for thiocyanate adsorbed at the gold aqueous interface is examined by both surface enhanced Raman spectroscopy SERS and subtractively normalized interfacial Fourier transform infrared spectroscopy SNIFTIRS. Both SERS and SNIFTIRS exhibit a C-N stretching band around 2120-2130 wavenumbers over the potential range 500 to -500 mV vs. s.c.e., consistent with the presence of a predominantly S-bound adsorbate. The potential-dependent C-N stretching band frequencies were very similar within ca. 5 wavenumbers for SNIFTIRS at smooth and electrochemically roughened gold, as well as for SNIFTIRS and SERS on the latter surface.
- Atomic and Molecular Physics and Spectroscopy