Photoionization Cross Sections of the Outers-Subshell Electrons in the Rare Gases

The absolute photoionization cross sections for the outer $\mathrm{ns}$ subshells of argon, krypton, and xenon have been measured from their respective ionization thresholds to 41 eV as well as at one point near the ionization threshold of neon. The technique of photoelectron spectroscopy was used to determine the ratio of the $s$ to $p$ photoelectrons. Measurements of the total cross sections and of the magnitudes of multiple-ionization processes allowed an accurate determination of the subshell cross sections to be made.