Date of Award

1994

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Physics and Astronomy

First Advisor

Richard L. Kurtz

Abstract

We have studied the electronic dispersion of Cu and the Cu/Ru(0001) bimetallic system using photoelectron spectroscopy. Images of electron emission from Cu(100), Cu(111), and Cu/Ru(0001) have been obtained using an ellipsoidal-mirror analyzer (EMA). This energy analyzer collects photoemitted electrons over a large solid angle, preserving their angular information and providing an image of intensity versus emission angle. The images provide direct information on band dispersion. The surface state of Cu(111) was measured using the EMA at different binding energies. By combining these images, we have obtained the surface state dispersion in three dimensional E vs k space. Our results are in excellent agreement with previous studies and provide a new perspective on studies of surface electronic structures. The Fermi surface of Cu was measured in both (111) and (100) directions. From these images, we have obtained the Fermi surface of Cu in three dimensional k-space by using the free electron final state assumption. The Cu/Ru(0001) bimetallic system with one monolayer Cu coverage was studied. We have obtained the first observation of the complete Brillouin zone of the Fermi surface of a two dimensional Cu(111) monolayer. Our result is in excellent agreement with the calculations of single-layer Cu(111). We have also studied the interface state of the Cu/Ru(0001) system located at 1.5 eV binding energy. Our data provide a complete mapping of this state throughout the Brillouin zone.

Pages

77

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