We present a study of characteristics of autoionization spectra for the Mg 3pns Rydberg series. The calculations were performed using multichannel quantum-defect theory combined with two versions of K matrices. The systematic investigation of states from the lower- to higher-lying members of the Mg 3pns Rydberg series allows one to reach a deeper understanding of physical manifestations involved. The calculations permit a detailed interpretation of recent experimental measurements in atomic magnesium. Energy levels are identified and assigned to the Mg 3pns autoionizing states for n greater than 6. A comparison with available experiments is provided.

• Received 27 September 1994

DOI:https://doi.org/10.1103/PhysRevA.51.2951