Abstract

The outer-subshell photoionisation is studied for the first five members of the 1s22s22p6 isoelectronic sequence (Ne, Na+, Mg2+, Al3+,l Si4+). The ab initio calculations are performed in the random phase with exchange approximation (RPAE) in a way which treats consistently transitions to the 1s22s22pvs1P and 1s22s22p5vd1P excited discrete and continuous states. The evolution of photoabsorption phenomena as the ionisation degree increases is presented.

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