Thermal desorption, indirect lateral interactions, and the 2${\pi }^{/emph>\mathrm{}}$ resonance model of CO chemisorbed on transition metals

Gumhalter, Wandelt, and Avouris [Phys. Rev. B 37, 8048 (1988)] have proposed a unified interpretation of a variety of experimental spectroscopic properties of chemisorbed CO on transition-metal surfaces in terms of a CO 2${\pi }^{\mathrm{*}}$ resonance. It is pointed out here that for the strongly chemisorbed state of CO on Pt(111), independent evidence in support of the same model comes from the analysis by Joyce et al. [J. Phys. C 20, 3381 (1987)] of the desorption measurements of Ertl, Neumann, and Streit [Surf. Sci. 64, 393 (1977)] as a function of coverage.