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Title:X-Ray Debye -Waller Factor Measurements of Helium Crystals
Author(s):Arms, Dohn Alexander
Doctoral Committee Chair(s):Ralph O. Simmons
Department / Program:Physics
Discipline:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Physics, Condensed Matter
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.
Issue Date:1999
Type:Text
Language:English
Description:176 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999.
URI:http://hdl.handle.net/2142/80672
Other Identifier(s):(MiAaPQ)AAI9952955
Date Available in IDEALS:2015-09-25
Date Deposited:1999


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