Xenon and krypton adsorption and palladium (100) and electron stimulated desorption of xenon, krypton, and argon

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6922357

Moog, E R

The absorption of Xe and Kr on the Pd(100) surface has been studied with thermodynamic, low energy electron diffraction, and work function experiments. Unlike on Ag(111), the author observed no 2D island formation for Xe down to 10 K. Quantitative measurement of the liquid-like diffraction pattern show that the diffuse ring of intensity increases in diameter, narrows and becomes more intense continuously with increasing coverage, suggesting repulsive adatom interactions. The isosteric heat vs. coverage gives the average potential energy in the lateral interactions which suggests a steep repulsion at short distances and no attractive well. At high temperatures the results for Kr are similar but there is evidence for island formation near 10K. The isosteric heat indicates a weak attractive interaction. The results are compared with published simulations for hard and soft disks. It is speculated that the additional interadatom repulsion on Pd is due to the direct overlap of the deformed electron distribution in the substrate. Electron stimulated desorption cross sections have been measured for Xe, Kr, and Ar absorbed on Ag(111). The Xe cross section is less than 10/sup -4/ A/sup 2/, the Kr cross section is strongly temperature dependent, rising from 0.01 A/sup 2/ at 10K to 0.18 A/sup 2/ at 50K; the Ar cross section is 4 A/sup 2/ and temperature independent.

• Research Organization: Wisconsin Univ., Madison (USA)
• OSTI ID: 6922357
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ADSORPTION
ARGON
COHERENT SCATTERING
DATA
DESORPTION
DIFFRACTION
ELECTRON DIFFRACTION
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
INFORMATION
KRYPTON
METALS
NONMETALS
NUMERICAL DATA
PALLADIUM
PLATINUM METALS
RARE GASES
SCATTERING
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
XENON