Abstract
We calculate the ionization-exitation and double ionization cross sections of the valence ${2s}^{2}$ shell of beryllium. Our model combines a multiconfiguration Hartree-Fock expansion of the beryllium atom ground state and a momentum space close-coupling expansion of the final ionized state. A near-complete set of negative and positive energy pseudostates is employed to represent various singly and doubly ionized channels. The role of the frozen ${1s}^{2}$ core is elucidated by comparing the beryllium single and double photoionization cross sections with those of the ``hollow'' helium ${2s}^{2}$ atom in which the $2s$ orbital is made orthogonal to the vacant $1s$ orbital. The angular correlation in the two-electron continuum is studied by calculating the triply differential cross section of Be at equal energy sharing between the photoelectrons.
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