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experimental study of LEED and UPS on bombarded and vacuum cleaved zinc(0001) surfaces

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Date Issued:
1996
Summary:
Several Zn single crystals were grown by the Bridgman method and their orientations were determined by the Laue X-ray back-reflection method. Zn(0001) surfaces were prepared by vacuum cleaving and by Ar+ bombardment with annealing. LEED patterns and UPS spectra were taken on both the cleaved and bombarded Zn(0001) surfaces. The LEED patterns from cleaved surfaces showed 6-fold symmetry whereas those from bombarded surfaces showed a hexagonal array but with some differences: the spots with the same distances from the center of LEED pattern had different intensities and they were dimmer and more blurry compared to those from the cleaved surface. A value of 2.64+-0.07 A for the nearest neighbor spacing was determined from the LEED patterns. The UPS spectra showed that for both types of surfaces the 3d peak is at 9.8 eV with a spin splitting of 0.7 eV, which are in agreement with previous experimental and theoretical results. Differences in spectra between the two types of surfaces were found in the ratios of signal/background and in the ratios of the 3d doublet.
Title: An experimental study of LEED and UPS on bombarded and vacuum cleaved zinc(0001) surfaces.
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Name(s): Liu, Yu
Florida Atlantic University, Degree Grantor
Jordan, Robin G., Thesis Advisor
Qiu, Shen-Li, Thesis Advisor
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Issuance: monographic
Date Issued: 1996
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, Fla.
Physical Form: application/pdf
Extent: 94 p.
Language(s): English
Summary: Several Zn single crystals were grown by the Bridgman method and their orientations were determined by the Laue X-ray back-reflection method. Zn(0001) surfaces were prepared by vacuum cleaving and by Ar+ bombardment with annealing. LEED patterns and UPS spectra were taken on both the cleaved and bombarded Zn(0001) surfaces. The LEED patterns from cleaved surfaces showed 6-fold symmetry whereas those from bombarded surfaces showed a hexagonal array but with some differences: the spots with the same distances from the center of LEED pattern had different intensities and they were dimmer and more blurry compared to those from the cleaved surface. A value of 2.64+-0.07 A for the nearest neighbor spacing was determined from the LEED patterns. The UPS spectra showed that for both types of surfaces the 3d peak is at 9.8 eV with a spin splitting of 0.7 eV, which are in agreement with previous experimental and theoretical results. Differences in spectra between the two types of surfaces were found in the ratios of signal/background and in the ratios of the 3d doublet.
Identifier: 15304 (digitool), FADT15304 (IID), fau:12074 (fedora)
Note(s): Thesis (M.S.)--Florida Atlantic University, 1996.
Subject(s): Metal crystals
Engineering, Materials Science
Low energy electron diffraction
Photoelectron spectroscopy
Held by: Florida Atlantic University Libraries
Persistent Link to This Record: http://purl.flvc.org/fcla/dt/15304
Sublocation: Digital Library
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Host Institution: FAU
Is Part of Series: Florida Atlantic University Digital Library Collections.