Accession Number:

ADA235921

Title:

Vibrational Spectroscopy of Ordered Oxygen Adlayers on Ni/Cu(001) and Co/Cu(001) Thin Film Systems

Descriptive Note:

Technical rept

Corporate Author:

INDIANA UNIV AT BLOOMINGTON DEPT OF PHYSICS

Personal Author(s):

• Kim, J. S.
• Mohamed, M. H.
• Kesmodel, L. L.

Report Date:

1991-05-15

Pagination or Media Count:

27.0

Abstract:

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.

Descriptors:

• *SPECTROSCOPY
• EPITAXIAL GROWTH
• OXYGEN
• VIBRATIONAL SPECTRA
• NICKEL
• PHONONS
• COBALT
• THIN FILMS
• SURFACE REACTIONS

Subject Categories:

• Electrical and Electronic Equipment
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE