Triple Photoionization of Lithium

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Abstract
Triple photoionization of an atomic three-electron system has been observed for the first time. Triply charged lithium (“bare lithium") was found in the photoion spectrum following synchrotron irradiation of neutral Li vapor. Sequential decay processes, which must result in at least one remaining bound electron, cannot account for such triple ionization. We have measured the triple-to-single photoionization ratio between 187 and 424 eV and made the first, rough estimate for this ratio. The measured triple-photoionization cross section never exceeds 6 b.

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