Direct determination of interactions at surfaces

We have obtained for the first time a fairly complete two dimensional picture of interactions between two adatoms on a surface as a function of both the interatomic distance and orientation. Four different combinations of adatoms, Re-Pd, W-Pd, Ir-Ir, and Re-Re, have been investigated on the (110) surfaces of tungsten. P(R), the probability of finding adatoms at the vector separation R is obtained from repeated observations of two adatoms at equilibrium on W(110), using a field ion microscope. Interactions are derived directly from the measured probabilities utilizing the Boltzmann relationship P(R) = C P$\sb0$(R) exp (-F(R)/kT), where P$\sb0$(R) is the probability of finding a non-interacting pair and F(R) the free energy of interaction for two adatoms separated by vector R; C is a normalization constant.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Materials Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Watanabe, Fumiya

• Physics, Condensed Matter
• Engineering, Materials Science

Statement dc:rights

• Copyright 1990 Watanabe, Fumiya

Language dc:language

eng

Identifier

AAI9114453
(UMI)AAI9114453

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/20452