Armstrong, Robin L.Cooke, Douglas Fraser2016-12-142016-12-141971http://hdl.handle.net/1807/75131The nuclear quadrupole resonance (NQR) frequencies (v) of the 35cl nuclei in the compounds rubidium hexachloroplatinate (Rb2PtCRl6 ) and cesium hexachloroplatinate (Rb2PtCRl6 ) were measured as functions of temperature in the range 4-500 K, under vacuum. The corresponding spin-lattice relaxation times (T1 ) were measured at the same temperatures above 60 K in Rb2PtCRl6 and above 77 K in Rb2PtCRl6. Both v and T1 were measured as functions of hydrostatic pressure in the range 1-500 kg cm-2 at four temperatures between room temperature and 380 K. A brief description of the apparatus and techniques used is presented…en-caPhysicsThesis