| xperimental techniques have been developed to obtain time resolved emission data at 77 K and polarized absorption data during shock loading. Single crystal ruby discs, encapsulated between z-cut sapphire discs, were shocked along the crystal c-axis to longitudinal stresses up to 120 kbar (below the yield limit of ruby). In the low temperature emission experiments, the ruby R lines were examined during loading and unloading. Both lines shift to lower energies and the splitting decreases with increasing compressive strain. These results are in good agreement with room temperature data corrected for temperature changes. The mean shift of the R lines as a function of density compression is within 2 percent of the hydrostatic shift. The changes in the R lines splitting, not observed during hydrostatic compression, are a consequence of nonhydrostatic deformation and reflect changes in the low symmetry crystal fields around the Cr;The... |
