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Ralph O. Simmons Arms, Dohn Alexander 2015-09-25T20:03:33Z 2015-09-25T20:03:33Z 10000-01-01 1999 1999 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. Made available in DSpace on 2015-09-25T20:03:33Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9952955.pdf: 7498278 bytes, checksum: ad7109e02e8cbcd95f5198d453167891 (MD5) Previous issue date: 1999 Embargo set by: Seth Robbins for item 81954 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 176 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999. http://hdl.handle.net/2142/80672 (MiAaPQ)AAI9952955 eng Physics, Condensed Matter X-Ray Debye -Waller Factor Measurements of Helium Crystals text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.