Triple ionization of lithium-like ions by photon impact

Within the framework of sudden approximation, the non-relativistic cross sections for the triple ionization of Li-like ions caused by absorption and Compton scattering of high-energy photons are calculated. The ratios of the triple-to-single and triple-to-double ionization cross sections are obtained. For neutral lithium atom, our predictions for σ3+/σ+ and σ3+/σ2+ are compared both with available experimental and theoretical results.