Coupled Hartree-Fock theory is used here to calculate the frequency-dependent dipole and quadrupole polarisabilities of Be, B + and C 2+ in their ground states 1 S. Particular emphasis is given to obtaining the excitation energies and the transition oscillator strengths for some low-lying excited states. The oscillator strengths are in very good agreement with those of more elaborate configuration-interaction calculations.
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Mukherjee et al. (1978) studied this question.
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