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Formulating a quasiclassical approach we determine the cross section for thecomplete four-body break-up of the lithium ground state following single photonabsorption from threshold up to 220 eV excess energy. In addition, we develop anew classification scheme for three-electron ionizing trajectories in terms ofelectron-electron collisions, thereby identifying two main ionization pathswhich the three electrons in the ground state of lithium follow to escape tothe continuum. The dominant escape paths manifest themselves in acharacteristic ``T-shape'' break-up pattern of the three electrons whichimplies observable structures in the electronic angular correlationprobability. This break-up pattern prevails for excess energies so low that theWannier threshold law $\sigma\propto E^{\alpha}$ describes already the tripleionization cross section, whose predicted value $\alpha=2.16$ we can confirmquantitatively.Comment: 14 pages, 7 figure

The Coulomb four-body problem in a classical framework: triple photoionization of lithium