He and Ne diffraction study of the W(100) phase transition

Journal Article · Mon May 01 04:00:00 EDT 1989 · J. Vac. Sci. Technol., A; (United States)

DOI:https://doi.org/10.1116/1.575989· OSTI ID:6117004

Schweizer, E K; Rettner, C T

Thermal energy helium and neon diffraction have been used to follow the phase transition of the W(100) surface which reconstructs to a c(2 x 2) structure on cooling below room temperature. In the He case we have confirmed previous observations that the reconstruction-induced half-order peaks broaden and shift towards the specular peak on heating through this transition. However, the corresponding Ne diffraction peaks show no appreciable shift or broadening under identical conditions, indicating that thermal He and Ne atoms probe surface structures with different periodicities. Since we would expect that the impinging He and Ne atoms probe quite similar potentials, this result is surprising and the first report for such behavior. These findings are consistent with an anomalous He scattering structure factor or the diffraction of He from a charge-density wave.

• Research Organization: IBM Almaden Research Center, San Jose, California 95120-6099
• OSTI ID: 6117004
• Journal Information: J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 7:3; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
CHEMICAL ANALYSIS
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
FLUIDS
GASES
HELIUM
HIGH TEMPERATURE
ION SCATTERING ANALYSIS
LOW TEMPERATURE
MEDIUM TEMPERATURE
METALS
NEON
NONDESTRUCTIVE ANALYSIS
NONMETALS
PHASE TRANSFORMATIONS
RARE GASES
SCATTERING
SURFACE PROPERTIES
TRANSITION ELEMENTS
TUNGSTEN
VERY HIGH TEMPERATURE