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197Au Mössbauer uses the 77.35 keV level which is populated by the decay of 20 hour 197Pt. This isotope is prepared by neutron irradiation of 196Pt in the `SlowPoke' at Ecole Polytechnique, Montreal. |
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The spectra at the left are our first set of test data. Starting from the top, we show: Metallic gold An Au3+ compound An Au+ compound The isomer shift is shown relative to metallic gold, and the velocity scale was determined using simultaneous calibration with a 57Co source and iron metal sample. The sample and source are both held at 4 K. |
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Au2Mn is antiferromagnetic, so the spectrum exhibits magnetic splitting at 4.5 K. An 11% admixture of E2 character to the decay means that all eight possible lines from the 3/2 -> 1/2 transition are allowed. The solid line is a fit to the data using the full Hamiltonian to combine the effects of the magnetic field and electric field gradient. |