Deep inelastic neutron scattering and single particle kinetic energies in condensed noble gases
Peek, Douglas Alan
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https://hdl.handle.net/2142/23239
Description
Title
Deep inelastic neutron scattering and single particle kinetic energies in condensed noble gases
Author(s)
Peek, Douglas Alan
Issue Date
1989
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
Single particle kinetic energies have been determined in solid and liquid neon and in several condensed noble gases by deep inelastic neutron scattering. The High Resolution Medium Energy Chopper Spectrometer at the Intense Pulsed Neutron Source at Argonne National Laboratory was used to measure the dynamic structure factor at values of the wave-vector transfer between 15 and 30 A$\sp{-1}$. Data have been analyzed with resolution techniques, and the single particle kinetic energies have been determined.
The ground state kinetic energy of solid neon is found to 49.2 $\pm$ 2.8 K. The kinetic energy demonstrates a slow rise as a function of temperature up to T = 26.4 K, which was the highest temperature at which data were taken. The value of the ground state kinetic energy is found to be large compared to theoretical prediction.
The single particle kinetic energy of liquid neon has been measured at three different places on the phase diagram, between temperatures of 25.4 and 35.3 K, and between saturated vapor pressure and 17.8 MPa. A slight density dependence of the kinetic energy at constant temperature is found, and theoretical predictions are in reasonable agreement.
The single particle kinetic energy of several condensed noble gases has been measured. The kinetic energies of solid argon at 82 K, solid krypton at 114.7 K, liquid krypton at 119.4 K, solid xenon at 153.4 K, liquid xenon at 221.3 K and liquid xenon at 273.1 K are found to be classical to within experimental error. This provides a good check on the absolute values of the neon measurements as well as a confirmation of the experimental uncertainties quoted.
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