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Helium-atom diffraction study of the submonolayer structures of sodium on Cu(001)

Physical Review B - Condensed Matter and Materials Physics, ISSN: 1550-235X, Vol: 56, Issue: 23, Page: 15378-15390
1997
  • 33
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  • 11
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Metrics Details

  • Citations
    33
    • Citation Indexes
      33
  • Captures
    11

Article Description

The structure and low-frequency vibrations of submonolayer coverages of sodium adsorbed on Cu(001) have been investigated using high-resolution helium-atom diffraction and time-of-flight measurements at (Formula presented) and 100 K. At low coverages, (Formula presented) the overlayer structures are determined by a strong repulsive interaction between neighboring sodium atoms, while the low-energy vibrations are characterized by a parallel frustrated translation mode ((Formula presented)-mode) frequency of (Formula presented) At higher coverages, (Formula presented) a series of quasi-one-dimensional structures are observed, and are accompanied by a substantial lowering of the (Formula presented)-mode frequency to (Formula presented) The diffraction patterns and low (Formula presented)-mode frequencies strongly indicate that the sodium atoms form one-dimensional islands in this coverage range. © 1997 The American Physical Society.

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