Abstract
Two different bonding states of carbon monoxide, “side-on” type and terminally bonded CO, are identified on Cr(111) at 200 K using XPS, UPS and HREELS. The side-on type CO with a low C O stretching vibrational frequency, 1100 cm −1, increases with CO exposure up to ∼0.5 L and decreases above that. On the other hand, the terminally bonded CO with a frequency of 1980 cm −1 appears at ∼0.45 L and increases with CO exposure. The binding energies of the C 1s and O 1s lines are 285.0 and 531.9 eV for the former and 286.3 and 532.6 eV for the latter, respectively. For the UPS spectra, the photoemission bands are observed at ∼21.75 and 12 eV for the former and 8.0 and 11.3 eV for the latter. Co-chemisorption study of CO and hydrogen suggests that the side-on type CO occupies twofold bridge sites.
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