Photoionization of positive ions. III. Mercury

Calculations of the photoionization of the $4f$ and $5d$ subshells in the mercury isonuclear sequence have been performed within the framework of a Hartree-Slater central-field model. The results, obtained from the neutral to ${\mathrm{Hg}}^{33+}$, show that removal of outer-shell electrons have virtually no effect on inner-shell cross sections even for subshells with delayed maxima and/or Cooper minima. The general systematics of the variation of $4f$ and $5d$ cross sections in the Hg isonuclear sequence is discussed.