Charge distributions of krypton ions that result from ionization in the $M$ shell by x rays have been measured with a magnetic mass spectrometer. X-ray energies ranged from 100 to 1400 eV. The following results are derived from the charge spectra: (a) In filling a hole in the $3d$ shell, an Auger process which generates two continuum electrons competes strongly with the common Auger process which generates one continuum electron. This so-called double Auger process occurs in (31±4)% of the events. (b) The Coster-Kronig transitions $3p-3dN$ and $3p-3d3d$ have nearly equal intensities. (c) Partial photoabsorption coefficients for $M$ electrons are poorly predicted by the Stobbe-Hall formula even for energies above 1 keV. Calculated shake-off probabilities of $M$ and $N$ electrons are given for the sudden removal of a $3s$, $3p$, or $3d$ electron.

• Received 22 April 1966

DOI:https://doi.org/10.1103/PhysRev.149.52