Infrared reflection absorption study of carbon monoxide adsorption on Cu(1 0 0)-(2 × 2)p4g-Pd ordered alloy surface

T. Wadayama, Y. Sasaki, K. Shiomitsu, A. Hatta

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Carbon monoxide (CO) adsorption on a Cu(1 0 0)-(2 × 2)p4g-Pd surface was investigated using infrared reflection absorption spectroscopy (IRRAS). The IRRAS spectra recorded during CO exposure to the room-temperature p4g surface show that marked absorptions that are ascribable to linearly bonded and bridge-bonded CO on Pd atoms dominate the spectra. In contrast, when the p4g surface is exposed to CO at 90 K, those two absorption bands appear first. Subsequently, a new band emerges at the high-frequency side of the linearly bonded CO-Pd band. The new band increases in intensity with further CO exposure, accompanied by a reduction in the CO-Pd band intensity. Based on IRRAS results obtained by heating the substrate, additional adsorption of CO onto the Cu atom surrounded by the CO-adsorbed Pd atoms correlates to the new band. The outermost atomic structure of the p4g surface is discussed based on those IRRAS results.

Original languageEnglish
Pages (from-to)72-82
Number of pages11
JournalSurface Science
Volume592
Issue number1-3
DOIs
Publication statusPublished - 2005 Nov 1

Keywords

  • Carbon monoxide
  • Copper
  • Infrared absorption spectroscopy
  • LEED
  • Palladium
  • Single crystal surfaces
  • Surface alloys

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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