X-Ray Debye -Waller Factor Measurements of Helium Crystals
Arms, Dohn Alexander
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https://hdl.handle.net/2142/80672
Description
Title
X-Ray Debye -Waller Factor Measurements of Helium Crystals
Author(s)
Arms, Dohn Alexander
Issue Date
1999
Doctoral Committee Chair(s)
Ralph O. Simmons
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
The 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.
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