High resolution electron energy loss studies of surface vibrations: Progress report, July 1, 1988--June 20, 1989
New experimental investigations of surface vibrational properties of materials with high-resolution electron energy loss spectroscopy (EELS) are reported. The effort has focused on surface phonon dispersion measurements for copper (111) and ultrathin epitaxial films of nickel and cobalt grown on a copper (001) substrate. Data and analysis of several surface modes and resonances on Cu (111) is consistent with a modest (15%) softening of the intraplanar force constant between surface atoms. For epitaxial thin films of a few monolayers thickness of nickel on Cu (001), new film modes are identified experimentally and correspond to vibrational motion localized primarily in the film. Measurements for epitaxial films of cobalt on a Cu (001) substrate exhibit substantial flattening of the Rayleigh phonon dispersion, suggestive of surface stress in the films.
- Research Organization:
- Indiana Univ., Bloomington (USA)
- DOE Contract Number:
- FG02-84ER45147
- OSTI ID:
- 6099429
- Report Number(s):
- DOE/ER/45147-4; ON: DE89013964
- Country of Publication:
- United States
- Language:
- English
Similar Records
High resolution electron energy loss studies of surface vibrations
High resolution electron energy loss studies of surface vibrations. Progress report, June 1, 1991--May 1, 1992
Related Subjects
360104* -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
COBALT
COPPER
DISPERSION RELATIONS
DOCUMENT TYPES
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY-LOSS SPECTROSCOPY
FILMS
LATTICE VIBRATIONS
METALS
NICKEL
PHONONS
PROGRESS REPORT
QUASI PARTICLES
SPECTROSCOPY
SUBSTRATES
SURFACE PROPERTIES
THIN FILMS
TRANSITION ELEMENTS