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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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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