INELASTIC NEUTRON-SCATTERING MEASUREMENTS OF OPTICAL VIBRATION FREQUENCY-DISTRIBUTIONS IN HYDROGEN-METAL SYSTEMS

Neutron energy loss cross section measurements on hydrogen metal systems are reported. Peaks were observed for a number of samples with fluorite structures where the hydrogens are located on regular tetrahedral sites with a view to examining whether factors other than the M – H distance (R) were important. Only small deviations from a correlation E(R) = A R-2/3 were in fact found. Frequency distributions for PdHx. (x = 0.70, 0.85, and 0.93) were also measured. Although the high frequency shoulder on the peak decreased in intensity, the high concentration curve was still far removed from the density of states curve obtained from Born-Von Karman fits to dispersion curves measured for PdD0.63. © by Akademische Verlagsgesellschaft