Abstract
Abstract The interaction of surface atomic oxygen with CO deposited in the presence of low-energy ion or electron irradiation on Cu(100) has been investigated using electron energy-loss spectroscopy. The coadsorbed O was found to induce a red-shift in the CO stretch frequency from its nominal position (≈259 meV) to 250 meV. Unlike the normal CO stretch which exists only below 200 K, the red-shifted peak could be observed at up to ≈420 K, which suggests that CO adsorption was stabilized by the coadsorbed O. Although several plausible mechanisms have been proposed to account for the shifts in the CO stretch induced by electron-donating and -withdrawing coadsorbates, on the basis of previous work on Cu cluster carbonyls and bond length considerations, we favour a “direct” interaction model involving a (tilted) CO molecule in an atop site and an O atom in a four-fold hollow site.
Published Version
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