Static field effect on the band intensity of adsorbed sulfate ions

Abstract

The effect of the static electric field at the electrochemical interface on the band intensity for the symmetric SO stretch of adsorbed sulfate ions on polycrystalline platinum electrodes is analyzed. A quadratic dependence of the band intensity on the static electric field is found. A model based on the field induced change of the dynamic dipole moment furnishes data on the dynamic dipole moment and the dynamic polarizability of adsorbed SO 4 2− 1. The measured ( ∂μ 0 ∂Q k ) is 89.5 esu g − 1 2 , and ( ∂ α ∂Q k ) is a function of coverage, ranging between 7.9 × 10 −4 and 11.6 × 10 −4 cm 2g − 1 2 .