Abstract
By only using electric-dipole forbidden emission lines, in what we label forbidden-line spectroscopy, we identified several energy levels in cadmium-like tungsten, . The spectrum was recorded at the Shanghai permanent-magnet electron beam ion trap in the visible region. The identifications were supported by large-scale multiconfiguration Dirac–Hartree–Fock calculations which involved careful investigations of core-valence and core-core correlation effects, and by relativistic many-body perturbation theory calculations. With this novel method we identified in all seven lines and measured their wavelengths. From this we can determine the relative position of seven energy levels. Due to the close degeneracy of two levels, we give alternative energies for three of the levels.
- Received 10 September 2014
DOI:https://doi.org/10.1103/PhysRevA.90.052517
©2014 American Physical Society