Observation of anomalous LEED patterns from Li adsorbed Cu(001): 2 × 1, 3 × 3 and 4 × 4

Hiroshi Tochihara, Seigi Mizuno

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Lithium adsorption on Cu(001) at 300 K has been studied with low-energy electron diffraction (LEED) and Auger electron spectroscopy. The LEED patterns show a sequential change with increasing Li coverage; 2 × 1, 3 × 3 and 4 × 4. The 2 × 1 LEED pattern has weak streaky spots denoted by a matrix of 1 2θ 0 -1 4θ 2 in the coverage range of 0.375 ≤ Θ ≤ 0.4. The 4 × 4 pattern disappears upon further Li deposition and the surface becomes disordered. The features and behavior of the streaky spots are very similar to those observed for K or Cs adsorption on Ni(110) or Cu(110) at room temperature, and this leads to a structure model for 2 × 1; the Cu(001) surface undergoes a missing row type restructuring induced by Li adsorption. Li adatoms are located in missing rows formed by themselves resulting in the streaky spots. Possible structure models for the 3 × 3 and 4 × 4 structures are proposed and they are assigned to ordered surface-alloys of LiCu on Cu(001).

Original languageEnglish
Pages (from-to)89-98
Number of pages10
JournalSurface Science
Volume279
Issue number1-2
DOIs
Publication statusPublished - Dec 1 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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