Abstract
We have measured the relative single and double photoionization cross section of magnesium from $22\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}54\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ photon energy using monochromatized synchrotron radiation. The corresponding double-to-single ionization ratio as well as the relative single photoionization cross section compares reasonably well with recent theoretical calculations [A.S. Kheifets and I. Bray, Phys. Rev. A 75, 042703 (2007)]. The photon energy dependence of the ratio can be modeled by a suitably scaled helium double-to-single photoionization ratio. However, to our surprise, a previously proposed scaling model for that ratio does not work in the case of Mg. From the near-threshold double-photoionization cross section we estimate the range of validity of the Wannier threshold law to be about $0.7\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ with a rather small cross section near threshold.
Published Version
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