SINGLE CRYSTAL ALIGNMENT METHOD FOR LEED EXPERIMENTS WITH UNGRADED TILT SAMPLE-HOLDERS

B. Blum
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B. Blum: INIFTA, C.C. 16 Suc. 4, (1900) La Plata, Argentina

Surface Review and Letters (SRL), 1997, vol. 04, issue 04, 629-635

Abstract: Good visual alignment of single crystal Cu(100)-p(1× 1) and c(2×2)-Bi surfaces was obtained, with an ungraded tilt sample-holder, by iteratively varying (i) the current in three sets of orthogonal Helmholtz coils around the LEED chamber, and (ii) the sample tilt, at low and high electron energies, respectively, until the observed diffraction patterns were symmetric at all energies. LEED I–V profiles of beams nominally equivalent by symmetry are shown for a total of 16 nonequivalent beams, between the two surfaces investigated. For Cu(100)-c(2×2)Bi, where magnetic field elimination was more accurate than for clean Cu, comparison of integral order beams with their average resulted inR2factors of 0.02 or better.

Date: 1997
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DOI: 10.1142/S0218625X97000626

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