  The low-energy electron spectra emitted in the radioactive decay of the
$^{83}$Rb and $^{83}$Sr isotopes were measured with a combined electrostatic
electron spectrometer. Radioactive sources used were prepared by ion
implantation of $^{83}$Sr into a high purity polycrystalline platinum foil at
30 keV and by vacuum-evaporation deposition of
  $^{83}$ Rb on the same type of foil. From the measured conversion electron
spectra, the electron binding energies (referenced to the Fermi level) for the
K, L$_1$ , L$_2$ , L$_3$ , M$_1$ , M$_2$, and M$_3$ shell/subshells of krypton
in the platinum host were determined to be 14 316.4(12), 1 914.3(9), 1
720.3(9), 1 667.6(9), 281.5(9), 209.6(13), and 201.2(15) eV, respectively, and
those for the evaporated layer were observed to be lower by 0.7(1) eV. For both
host matrices, values of 2.3(2), 4.6(2), 1.7(2), 1.3(2), and 3.2(3) eV were
obtained for the krypton K, L$_1$ , L$_2$ , L$_3$ , and M$_1$ natural atomic
level widths, respectively. The absolute energies of 10 838.5(9) and 10
839.5(10) eV were measured for the KL$_2$L$_3$ ($^{1}$D$_2$) Auger transition
in krypton implanted in Pt and generated in the evaporated rubidium layer,
respectively. A value of 601.0(8) eV was measured for the energy difference of
the KL$_2$L$_3$ ($^{1}$D$_2$) transitions in Rb and Kr in the Pt host.
Multiconfiguration Dirac-Fock calculations of the krypton KLL transition
energies and intensities were also performed.
