Abstract
The ground configuration of neutral tungsten is 5d46s2. The first excited configurations in the odd parity system are 5d36s2 (6p+7p+5f+6f)+5d46s6p. Further excitation leads to large number of configurations. However the configuration 5d56p belonging to the odd parity was obtained by doubly exciting the 5d46s6p configuration. Relativistic Hartree–Fock (HFR) and least squares fitted (LSF) parametric calculations were carried out to interpret the observed spectrum recorded on a 1.5-m Wadsworth spectrograph at our laboratory in the wavelength region 2300Å to 4500Å. We confirmed the earlier reported ground configuration 5d46s2 and excited configuration 5d46s6p. Almost fifty new transitions establishing 22 energy levels belonging to the configuration 5d36s26p have been identified.
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