Rotationally anisotropic second-harmonic generation studies of the structure and electronic properties of bimetallic interfaces, Ag on Cu(110)

Conference · Mon Jan 01 04:00:00 EST 1990

DOI:https://doi.org/10.1117/12.17876· OSTI ID:6973371

Hoffbauer, M A; McVeigh, V J

Rotationally anisotropic surface second-harmonic generation (SHG) has been measured from a clean, well-ordered Cu(110) single-crystal surface as a function of both surface temperature and Ag coverage. For the clean Cu(110) surface, the temperature dependence of the SH response at a fixed azimuthal angle can be correlated with a surface phase transformation. A large decrease in the rotationally anisotropic SH response as a function of surface temperature can be related to changes in the surface disorder. The results are compared with other studies of Cu(110) surface structure using both x-ray and He-atom scattering. The rotationally anisotropic SH response has also been measured as a function of Ag coverage with the Cu(110) surface temperature fixed at 300 K. The results closely follow the formation of an ordered Ag(111)-like overlayer, the nucleation of three-dimensional Ag nanoclusters (<20 {angstrom} thick) that enhance the anisotropic SH response, and the subsequent growth of a {approximately}10 monolayer thick Ag film. Variations in the rotationally anisotropic SH response as a function of Ag coverage are used to separate the resonant surface electronic contributions to the nonlinear susceptibility of the interface. 22 refs., 4 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/MA
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6973371
• Report Number(s): LA-UR-90-965; CONF-900140--17; ON: DE90008924
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals &amp; Alloys-- Structure &amp; Phase Studies
360104* -- Metals &amp; Alloys-- Physical Properties
ANISOTROPY
COPPER
CRYSTALS
ELECTRONIC STRUCTURE
ELEMENTS
FREQUENCY MIXING
HARMONIC GENERATION
INTERFACES
LASERS
METALS
SILVER
SURFACES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS