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We summarise recent work for photoabsorption by beryllium-like ions, giving particular emphasis to our own study of bound-bound and bound-free transitions in the following members of the sequence : Be to Si+10, S+12, A+14, Ca+16 and Fe+22. Our calculations are based on the quantal close-coupling approximation in which only electrostatic interactions are taken into account. A total of 1814 LS terms have been identified and their energies determined. Weighted oscillator strengths (g f values) for 33030 electric dipole transitions amongst these levels have been evaluated. We have also calculated cross sections for photoionisation from 1554 levels lying below the first ionisation threshold. Photoexcitation of the core produces large PEC resonances ; these dominate many of the cross sections for Be and the less highly ionised ions. We give selected samples of our data and make comparisons with the work of other investigators

AN UPDATE OF OSCILLATOR STRENGTHS AND PHOTOIONISATION CROSS SECTIONS FOR THE Be ISOELECTRONIC SEQUENCE