Relativistic Theory of Low Energy Electron Diffraction: Application to the (001) and (110) Surfaces of Tungsten

Abstract

A relativistic theory for calculating low energy electron diffraction intensities and spin polarization properties is applied to the (001) and (110) surfaces of tungsten for several angles of incidence. Intensity-energy profiles are obtained in generally good agreement with experimental data. Relativistic effects on intensities are found t o be noticeable, and appreciable spin polarization features are predicted. I n particular, large degrees of spin polarization in conjunction with sizeable intensities are found in the specular beam for large angles of incidence on W(OO1).

Relativistic effects on LEED intensities from Au(111)

“…firstly, the diffracted beams show strong spin polarization effects, which were predicted by theory [2,3] and observed experimentally [4,5] and secondly, relativistically calculated intensities for W(110) [3], W(OO1) [6] and Pt(ll1) [7] were found to deviate significantly from their nonrelativisticahy calculated counterparts and to yield better agreement with the experiment. With recent interest focusing on the structure of heavy transition metal surfaces, it is therefore pertinent to study relativistic effects on LEED intensities more extensively and to establish their importance for structure determination.…”

Field, Thermionic, and Secondary Electron Emission Spectroscopy

“…The problem reduces to that of calculating the reflection matrix RC (Section 5.3) taking into account the above-mentioned effects. A method for doing this has been developed by Feder (1972Feder ( , 1974. ]…”