The case of a unique autoionization decay dynamic: the 3p to nd resonances in Cr

A unique autoionization decay dynamic is encountered in Cr. It embraces several correlated processes. First, the 3p to 3d and the rest of the 3p to nd resonant excited orbitals are subject to dramatic orbital anti-collapse. Second, the giant 3p to 3d resonance and the rest of the 3p to nd Rydberg series are essentially configurationally mixed with one another. Thirdly what is particularly unusual is that the giant 3p to 3d resonance decays while the orbital anti-collapse is in full progress. This dramatically affects not only the final parameters of the 3p to 3d resonance itself, but through the configuration mixing this critically reflects on those for the rest of the 3p to nd Rydberg series. All this finally results in the unique resonance structure in the 3p absorption spectrum of Cr, which has been a puzzle for many years. A way to introduce what are called the 'relaxed transition states' for the 3p to 3d autoionizing decay and thus to describe correctly the whole resonance structure in Cr is proposed. Good agreement between the calculated and experimental data for the Cr 3p absorption is achieved.

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