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Doctoral Dissertation Announcement
Candidate: Xue Wang
Degree of:
Doctor of Philosophy
Department: Physics
Title: Structure and Excitations in Metal Ammonia Compounds
Committee:
Dr. Clement Burns, Chair
Dr. Pnina Ar-Gur
Dr. Sung Chung
Dr. Arthur McGurn
Dr. Lisa Paulius
Date: Monday, November 5, 2007 2:00 p.m.- 4:00 p.m.
2202 Everett Tower
Abstract:
This dissertation is composed of two parts. In the first part, inelastic X-ray scattering technique was used to measure the plasmon excitations in liquid lithium ammonia systems. The measurements were carried out for different metal concentrations, 8 mole per metal (MPM), 10 MPM, 11 MPM, 16 MPM and 20 MPM of temperature 200K. The data were analyzed to determine the plasmon energy and the linewidth as a function of momentum for each metal concentration. Deviations from the random phase approximation (RPA) in the jellium model increase as the concentration is lowered.
In the second part of this work, elastic X-ray scattering was used to measure the structure of quenched sodium ammonia mixtures at different concentrations (0 MPM, 3 MPM, 6 MPM, 9 MPM, 12 MPM and 15 MPM). An amorphous structure is found in quenched sodium ammonia systems and its properties are discussed.