Low temperature infrared spectra of CO adsorbed on the surface of MgO(001) thin films
2005; Elsevier BV; Volume: 596; Issue: 1-3 Linguagem: Inglês
10.1016/j.susc.2005.09.019
ISSN1879-2758
AutoresMartin Sterrer, Thomas Risse, Hans‐Joachim Freund,
Tópico(s)Spectroscopy and Laser Applications
ResumoReflection–absorption infrared spectra of CO adsorbed on the surface of thin MgO(0 0 1) films are reported in the temperature range 30–90 K. The observed bands are identical with those reported earlier for MgO single crystals and powder samples. By selective population of low-coordinated (LC) sites and from the analysis of respective TPD spectra a desorption energy for LC sites of ∼25 kJ mol−1 was derived, in perfect agreement with recent findings on MgO powders. Experiments with 12CO/13CO give evidence for substantial infrared intensity transfer between neighboring CO oscillators and the formation of adsorbate complexes containing more than one CO molecule on low-coordinated sites.
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