The Spectrum of Singly Ionized Tungsten

The ab initio calculations were performed using Cowan's computer code for ground configuration 5d(4)6s incorporating other interacting even parity configurations 5d(3)6s(2) and 5d(5), also for the three lowest excited configurations 5d(4)6p,5d(3)6s6p and 5d(3)6s5f of odd parity matrix. The initial energy parameter scaling applied for E-av and zeta at 100% of the HFR values and Fk at 85%, Gk and Rk at 75% of the HFR values. The reported values of levels were taken from NIST ASD levels list. The levels were used to run least square fitted (LSF). This allowed adjusting the energy to the real values and hence a better prediction was achieved.