SOLID-STATE AND NUCLEAR RESULTS FROM A MEASUREMENT OF PRESSURE DEPENDENCE OF ENERGY OF RESONANCE GAMMA RAY OF 197AU

Metallic gold has been subjected to a sequence of pressures in the range from 0 to 70.6 kbar at a temperature of 4.2°K, and the change of the energy of the Au197 resonance ray with pressure has been measured. The measurements were made by the Mössbauer method. The result for dEdP is in good agreement with an earlier prediction for this quantity based on a correlation of the Mössbauer isomer shift with residual electrical resistance for a series of dilute gold alloys. We have used the Wigner-Seitz approximation to describe the gold 6s band, and this wave function has been calculated in a relativistic Hartree approximation. Within this treatment we find that the gold nucleus increases in size when excited, with rr+1.5×10-4. A brief comment is made on the bearing which these results have on the charge and screening of gold atoms in dilute gold alloys. © 1969 The American Physical Society.