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Polarization modulation infrared reflection absorption spectroscopy at elevated pressures: CO adsorption on Pd(111) at atmospheric pressures

Journal of Physical Chemistry B, ISSN: 1089-5647, Vol: 106, Issue: 36, Page: 9367-9371
2002
  • 109
    Citations
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  • 71
    Captures
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Metrics Details

  • Citations
    109
    • Citation Indexes
      109
  • Captures
    71

Article Description

CO adsorption on a Pd(111) single-crystal surface was investigated using in situ polarization modulation infrared reflection absorption spectroscopy (PM-IRAS) within the pressure range 10-800 mbar. The coverage-dependent CO overlayer structures found on the Pd(111) surface are identical throughout this pressure regime, that is, no new surface species at elevated pressures or adsorbate-induced substrate reconstructions were observed. The transition from an adsorbate superstructure dominated by bridged-bound CO to an adsorbate overlayer having 3-fold/atop CO sites was followed by varying the adsorbate pressure over 9 orders of magnitude. The derived phase diagram indicates an apparent activation energy of 44.35 ± 1.63 kJ/mol for the bridged-to-3-fold-hollow/atop transition. A comparison between these data and recent sum frequency generation (SFG) results is made.

Bibliographic Details

Emrah Ozensoy; Douglas C. Meier; D. Wayne Goodman

American Chemical Society (ACS)

Chemistry; Materials Science

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