He diffraction study of the structural phase transition on the Ge(111) surface at 550 K

Jeong Sook Ha, E. F. Greene

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A structural phase transition on the Ge(111) surface is investigated using thermal energy He scattering by observing the temperature dependence of several diffraction peaks. The presence of strong quarter-order peaks confirms that the Ge(111) surface has three orientational domains of a c(2 × 8) reconstruction at room temperature. As the temperature rises, all the superlattice peaks decrease in intensity without broadening and disappear above 550 K. In addition there is one striking feature which has not been observed in earlier low energy electron diffraction and reflection high energy electron diffraction experiments. The half-order peak shows continuous broadening and a shift of its maximum toward the specular peak as the temperature increases above 550 K. Consideration of several possible explanations for such a peak shift suggests that the transition, which may be driven by a charge density wave, is to an incommensurate phase.

Original languageEnglish
Pages (from-to)7957-7963
Number of pages7
JournalThe Journal of Chemical Physics
Volume91
Issue number12
Publication statusPublished - 1989 Dec 1
Externally publishedYes

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Diffraction
Phase transitions
diffraction
Electron reflection
Charge density waves
Temperature
Reflection high energy electron diffraction
Low energy electron diffraction
electron diffraction
Thermal energy
shift
Scattering
thermal energy
high energy electrons
temperature dependence
temperature
Experiments
room temperature
scattering
energy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

He diffraction study of the structural phase transition on the Ge(111) surface at 550 K. / Ha, Jeong Sook; Greene, E. F.

In: The Journal of Chemical Physics, Vol. 91, No. 12, 01.12.1989, p. 7957-7963.

Research output: Contribution to journalArticle

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