Photoemission spectroscopy of surfaces and adsorbates

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6774987

Chiang, T C; Kaindl, G; Himpsel, F J; Eastman, D E

Core level photoelectron spectroscopy is providing new information concerning the electronic properties of adsorbates and surfaces. Several examples will be discussed, including studies of adsorbed rare gas submonolayers and multilayers as well as clean metal surfaces. For rare gas multilayers adsorbed on metal surfaces, the photoelectrons and Auger electrons exhibit well-resolved increases in kinetic energy with decreasing distance between the excited atom and the substrate, allowing a direct labeling of the layers. These energy shifts are mainly due to the substrate screening effects, and can be described well by an image-charge model. For a Kr/Xe bilayer system prepared by first coating a Pd substrate with a monolayer of Kr and then overcoating with a layer of Xe, a thermally activated layer inversion process is observed when the temperature is raised, with Xe coming in direct contact with the substrate. For rare gas submonolayers adsorbed on the Al(111) surface, coverage-dependent core level shift and work function measurements provide information about the adatom spatial distributions, polarizabilities, and dipole moments for the ground and excited states. We have also studied the 2p core level shifts for a clean Al(001) surface relative to the bulk. The shifts have a large contribution from the initial-state effects.

• Research Organization: Illinois Univ., Urbana (USA); Freie Univ. Berlin (Germany, F.R.). Inst. fuer Atom- und Festkoerperphysik; IBM Watson Research Center, Yorktown Heights, NY (USA)
• DOE Contract Number: AC02-76ER01198
• OSTI ID: 6774987
• Report Number(s): DOE/ER/01198-1388; CONF-820855-2; ON: DE82021591
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADSORPTION
ALUMINIUM
BINDING ENERGY
CRYSTALS
DATA
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
FLUIDS
GASES
INFORMATION
KRYPTON
METALS
MONOCRYSTALS
NONMETALS
NUMERICAL DATA
P STATES
PHOTOELECTRON SPECTROSCOPY
RARE GASES
SORPTION
SPECTROSCOPY
SURFACES
XENON