The adsorption of formic acid (HCOOH) on oriented (110) and (111) gold surfaces was studied by High Resolution Electron Energy Loss Spectroscopy (HREELS). The measurements undertaken at low substrate temperature (∼ 100 K) showed that, up to 15 L exposure no vibrational band due to the hydroxylic group (OH) is observed on the (110) surface. On the contrary, the spectra recorded on the Au(111) samples exhibit a very strong out-of-plane vibration π(OH) at 950 cm-1. this perceptible difference implies that the surface orientation effects of the HCOOH adsorption behaviour during the first 20 L. Precise information, extracted from the HREELS data processing are presented. HCOOH-dimer-like is discussed as possible configuration on the Au(111) surface. © 1985.
Chtaïb, M., Thiry, P. A., Pireaux, J. J., Delrue, J. P., & Caudano, R. (1985). Evidence for different adsorption configurations of HCOOH on Au(111) and Au(110). Surface Science, 162(1–3), 245–251. https://doi.org/10.1016/0039-6028(85)90902-1