Determination of Mass-Attenuation Coefficients in Krypton and Xenon by Continuous Analysis between 8 and 0.8 keV

The bremsstrahlung emitted from a tungsten anode in an x-ray tube has been used for continuous analysis of krypton and xenon absorption spectra between 8 and 0.8 keV (1.5 to 15 Å). Attenuation coefficients were determined every 0.05 Å between 1.5 and 8 Å (in steps of energy varying from 150 to 10 eV) and every 0.1 Å between 8 and 15 Å (20 to 5 eV). Results obtained are compared with previously determined experimental values and with semiempirical and theoretical determinations. Tabulated data of McMaster et al. and calculations of McGuire are shown to be in good agreement with the experimental results, generally within 10%. Multiply excited and ionized states have been observed in krypton, owing to simultaneous interaction of incident radiation with $2p$ and $4p$ (and $4s$) electrons, and a nonhydrogenic behavior of the xenon $3p$-subshell photoionization cross section has been revealed. Krypton and xenon $L$ and xenon $M_{\mathrm{III}}$ absorption jump ratios have been determined. Finally, continuous oscillator strengths of krypton and xenon $L$ shells and the xenon $M$ shell have been evaluated.