Temperature-dependent growth and surface morphologies of AgBr on Ag(111)
Angle-resolved photoemission with synchrotron radiation has been used to probe the surface morphologies of AgBr deposited by molecular beam epitaxy onto Ag(111), as a function of coverage and substrate temperature. Depositions performed at 130[degrees]C yield results consistent with a Stranski-Krastanov (SK) growth, whereas surfaces prepared at [minus]190[degrees]C exhibit a more nearly layer-by-layer growth. These interpretations are supported by core-level studies which probed the binding energies and intensities of the Br 3d core level and by valence band measurements. Low-energy electron diffraction (LEED) observations show the initial SK layer to have a ([radical]3 x [radical]3) R30[degrees] structure, while heavier depositions exhibit indications of AgBr(111) islands. Cold depositions show no long range order. Surface morphology changes induced by warming a cold deposition were also investigated. The dependence of the binding energies of the AgBr valence states on photon energy and electron emission angle indicates that the electronic structure of the SK layer is two-dimensional. Photoelectron diffraction studies were performed on samples prepared at 130[degrees]C to elucidate geometrical structure, the results of which were inconclusive.
- Research Organization:
- Wisconsin Univ., Madison, WI (United States)
- OSTI ID:
- 5652305
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
SILVER BROMIDES
CRYSTAL GROWTH
CRYSTAL STRUCTURE
ELECTRONIC STRUCTURE
BINDING ENERGY
ELECTRON DIFFRACTION
MOLECULAR BEAM EPITAXY
MORPHOLOGY
PHOTOEMISSION
SURFACES
SYNCHROTRON RADIATION
TEMPERATURE DEPENDENCE
VALENCE
BREMSSTRAHLUNG
BROMIDES
BROMINE COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY
EPITAXY
HALIDES
HALOGEN COMPOUNDS
RADIATIONS
SCATTERING
SECONDARY EMISSION
SILVER COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360602* - Other Materials- Structure & Phase Studies
400201 - Chemical & Physicochemical Properties
664000 - Atomic & Molecular Physics- (1992-)