MANY-ELECTRON ATOMS IN HIGH MAGNETIC-FIELDS

We present a report on experiments performed at Imperial College on di amagnetic effects in many-electron atoms. These include both atomic-be am experiments with DC fields, for which the measurement technique inv olves detecting Rydberg atoms after laser excitation, and experiments on columns of atomic vapour, in which case we have studied Faraday rot ation induced by a pulsed magnetic field. In the atomic-beam experimen ts, interesting differences between the sigma+ and sigma- spectra have been observed. We also describe theoretical work related to the inter pretation of the data for both sets of experiments.