Evidence for different adsorption configurations of HCOOH on Au(111) and Au(110)

  • Chtaïb M
  • Thiry P
  • Pireaux J
 et al. 
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Abstract

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.

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