The study of energy levels and radiative lifetimes of even-parity J=1 state of magnesium

The energy levels and lifetimes of 3sns 3S1 (n = 4-20) and 3snd 3D1 (n = 3-20) of neutral magnesium are calculated and predicted by means of the multichannel quantum defect theory (MQDT). In addition, the analyses of perturbation images between the channels are given.