Re-investigation and line identifications for W11+ in the visible range

Abstract

Abstract We present a new investigation of unidentified emission lines in 350–660 nm from W11+ at a compact electron-beam ion trap in Shanghai. To help the line identification, transition energies of the lowest 48 levels are calculated by the large-scale relativistic configuration interaction and multiconfiguration Dirac–Hartree–Fock calculation. The results from the two calculations are in good agreement with each other and the deviation is 0.66% on average. By using the collisional-radiative model implemented in the flexible atomic code, six observed lines for the visible spectrum of W11+ are identified as magnetic-dipole transitions from 4f 125s 25p 3 and 4f 135s 25p 2 configurations.