Abstract
Abstract In situ IR-transmission spectroscopy from 1300 cm −1 to 5900 cm −1 was performed on flat iron ultrathin films on MgO(001) in UHV before and after exposure to oxygen. Spectra of pure Fe films show an absorption that is strongly determined by film–surface scattering of charge carriers. The adsorbate induced IR-optical surface resistivity is observed by a significant broadband increase of transmission. Applying a proper description of the frequency dependent electron scattering rate of iron and including Persson's surface resistivity model we succeed in explaining this broadband spectral change. We calculate an electron–adsorbate scattering rate, which leads to reasonable values for the dc conductivity of the investigated ultrathin films and for the electron-hole lifetime of adsorbate motion.
Published Version
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