Eigenchannel quantum-defect theory of open-shell atoms. II. Calculation of 3p4(3P)ns Rydberg spectra of the chlorine atom

Rydberg spectra of the chlorine atom 3$s^2$3$p^4$ ${(\mathrm{}}^3$P)ns, J=(1/2), (3/2), and (5/2), are calculated by use of an eigenchannel quantum-defect method. The results indicate that the channel interactions due to electrostatic and spin-orbit potentials are weak. The effect due to channel interaction of the 3s3$p^6$ configuration is completely negligible. Agreement with emission data is excellent (≲0.2% accuracy except for the lowest n=4 levels). Autoionization resonances are predicted.