Properties of Solid Hydrogens as a Function of Pressure Up to 600 KBAR

摘要

In this thesis the results of Raman scattering experiments on solid molecular hydrogen and deuterium are presented. In chapter 1 an introduction to the properties of solid molecular hydrogen is given. The experimental setup used to apply high pressure at low temperature is discussed in chapter 2, there also sample preparation, pressure calibration and other experimental procedures are discussed. Chapter 3 deals with the observation of vibrons. These data can be used at a test for the isotropic intramolecular potential. Rotons and phonons are discussed in chapter 4. The interesting phenomenon of hybridization of these two lattice modes was observed and is interpreted quantitatively. The roton and phonon data yield information on the intermolecular potential and phonon data can be used to obtain T not equal to 0 K isotherms once p(V) at T = 0 K is known. In the final chapter 5 the observation of a phase transition associated with the breakdown of free rotor states is presented for deuterium and compared with theoretical models. A prediction for this phase transition in hydrogen is also given. (Atomindex citation 13:712281)