Channel interaction of Ba 6pnd (JÂ =Â 1, 3) autoionizing states

The channel interaction of Ba 6pnd (J = 1, 3) autoionizing series has been investigated by means of unsaturation and saturation excitation methods, using a three-step isolated-core-excitation scheme with a proper polarization configuration of lasers. The physical manifestations of the observed interactions are analyzed by the cross-section and spectral density calculated from the multichannel quantum defect theory, whose results are quite satisfactory with experimental ones.