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The 2p-subshell absorption spectrum of Al III

The photoabsorption spectrum of Al III has been observed in the 175-120 AA (571 000-833 000 cm-1) spectral region, using the continuum radiation emitted by a laser-produced plasma as a background source. All the observed transitions involve the excitation of a 2p-subshell electron. The electron configuration of the upper levels is of the type 2p53snd or 2p53sns. A critical analysis of the spectrum is made with the help of multiconfigurational relativistic atomic structure calculations. It is found that the 2p53p2 configuration acts as a strong perturber and that there is departure from LS coupling for many of the terms. Lines belonging to the transition array 2p63p to 2p53s3p were also observed.