Abstract
In ultra-high vacuum (UHV) we have measured infrared transmission spectra of CO on ultra-thin films of iron grown at about 315 K on UHV-cleaved MgO(001). Even at normal incidence of light we observe several asymmetric CO stretching lines with positions, intensities and shapes dependent on film morphology. The CO stretching lines observed are enhanced by at least two orders of magnitude with respect to adiabatic values. Enhancement and asymmetry are correlated to the curvature of transmission spectra of the bare iron films which is a measure of the dynamic conductivity, i.e., of the degree of continuity of the films formed by the growth of three-dimensional epitaxial islands.
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