Adsorption of CO on W(001) by high resolution electron spectroscopy |
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Authors: | A Adnot JD Carette |
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Institution: | Centre de Recherches sur les Atomes et les Molécules et Département de Physique, Faculté des Sciences et de Génie, Université Laval, Québec, P. Qué., Canada G1K 7P4 |
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Abstract: | The vibrational modes induced by CO on W(001) at temperatures ? 350 K are detected by means of electron energy loss spectroscopy with resolution in the 6–7 meV range. Two β adsorption regimes are identified depending on coverage. Heating at various increasing temperatures reveals coverage dependant irreversible surface structure modifications. The β spectra after adsorption or desorption are discussed in terms of the usual questions of multiple β states, dissociation, and reconstruction. The α1 and α2 states are detected both by their WC and CO frequencies. A small signal is assigned to a new a-state, named α3, which may explain some thermal desorption results. |
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