Back to results
University of Illinois at Urbana-Champaign
X-Ray Debye -Waller Factor Measurements of Helium Crystals
Abstract
dc:descriptionThe measured results agree well with computational values, made using path integral Monte Carlo methods. The Lindemann ratios were around 0.11 for both isotopes, with the 3He values being larger at similar densities. A 3He-4He mass-scaling factor of 4/3 for the equivalent Debye temperature for the measured Debye-Waller factor was observed. This Debye temperature falls with increasing temperature, contrary to what would be expected for a quasi-harmonic model, most likely due to multi-phonon processes being present in the crystals.
Degree
thesis:*- Name thesis:degree_name
- Ph.D.
- Level thesis:degree_level
- Dissertation
- Discipline thesis:degree_discipline
- Physics
- Grantor
- University of Illinois at Urbana-Champaign
- Year dc:date
- 2015
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Arms, Dohn Alexander
- Contributors dc:contributor
-
- Ralph O. Simmons
Subjects
dc:subject × 1Rights
- Language dc:language
- eng
Identifiers
dc:identifier.*- Identifier
- (MiAaPQ)AAI9952955
- OAI identifier oai:identifier
- oai:www.ideals.illinois.edu:2142/80672