Abstract
The 6pnf J=2,3,4 autoionizing levels of barium are studied through a combination of the eigenchannel R-matrix and the multichannel quantum defect theory (MQDT) methods. The calculation reproduces well the spectra of 6pnf series observed in excitation from 5d6p levels and confirms that the 6pnf levels have very large autoionization rates. Calculated MQDT parameters are compared with those obtained empirically from experiment and used to analyse channel interactions.
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