High ResolutionMX-Ray Emission Spectrum of Metallic Uranium (Z= 92)

The M x-ray emission spectrum of metallic U ( Z = 92) was measured with a high precision double crystal spectrometer. The binding energies and linewidths of the M 4,5 -levels are determined and compared with the available theoretical calculations. The results are analysed in terms of Coster-Kronig decay processes and fluctuations. The broad high-energy satellite bands accompanying the M α1 and M β lines were isolated by fitting Lorentzian profiles to the main lines and analysed in terms of M 5 X-N 7 X and M 4 X-N 6 X double hole excitations created predominantly by Coster-Kronig decay processes of an M shell hole.