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In a quasiclassical framework, we formulate the quadruple ionization bysingle photon absorption of the Coulomb five-body problem. We present thequadruple photoionization total cross section of the ground state of Berylliumfor energies up to 620 eV. Our quasiclassical results for energies close tothreshold are in agreement with the Wannier threshold law for four electronescape. In addition, the agreement of our results with a shape formula providessupport for the overall shape of our total quadruple cross section. Finally, wefind that the photon energy where the maximum of the total photoionizationcross section occurs for single, double, triple and quadruple photoionizationof H, He, Li and Be, respectively, seems to follow a linear relation with thethreshold energy for complete break-up of the respective element.

Total quadruple photoionization cross section of Beryllium in a quasiclassical framework