Vibrational Spectroscopy of Ordered Oxygen Adlayers on Ni/Cu(001) and Co/Cu(001) Thin Film Systems
INDIANA UNIV AT BLOOMINGTON DEPT OF PHYSICS
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We report surface vibrations in c2x2 oxygen adlayers on Ni and Co thin films on a Cu 001 substrate measured at gamma by high resolution EELS. For the Ni thin film surface, one phonon peak is measured for varying film thickness from 1.3 ML monolayer to 6 ML with a constant energy of 221cm -1. For the CO thin film surface, three loss peaks are found, whose relative intensities change as the film thicknesses are varied. One loss peak ca. 520 cm -1 is tentatively assigned to the Fuchs-Kliewer mode of cobalt oxide CoO. The other two peaks at 317 cm -1 and 376 cm -1 are likely related to different bonding sites. Surface phonons on the p2 x2 Co thin film 389 cm -1 and a bulk resonance mode 115 cm -1 are also reported.
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