Onset and Near Threshold Evolution of the Cu K α X-Ray Satellites

M. Deutsch, O. Gang, K. Hämäläinen, K. K. Kao

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The evolution of the Cu K α3,4 spectrum is studied from threshold to saturation using synchrotron radiation photoexcitation. A pure shake-off behavior is observed, with a smooth and monotonic intensity rise from zero to saturation, confirming theoretical predictions. Different onset energies are observed for the spectral features, but the shape of the spectrum is found to be invariant for energies higher than 50 eV above threshold. Full-spectrum fits based on ab initio Dirac-Fock calculations and measured onset energies conclusively show thesatellites to result from 2 p spectator transitions only, as predicted.

Original languageEnglish
Pages (from-to)2424-2427
Number of pages4
JournalPhysical Review Letters
Issue number14
StatePublished - 1996


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