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Measurement of the Spectral Distribution for the Two-Photon Decay of the 1s2s 1S0 level in Heliumlike Gold

A first measurement of the spectral distribution of the two-photon decay of the 1s2s 1S0 level in heliumlike gold is reported. This study extends our earlier work for heliumlike krypton and nickel to higher atomic numbers Z into the fully relativistic regime. The measured spectral shape of the two-photon decay differs from that observed at intermediate Z but is in agreement with the results of a recent fully relativistic calculation of Derevianko and Johnson.