Extended analysis of four-times ionized barium: (Ba V)

- The spectrum of Ba was recorded on a 3-m spectrograph with triggered spark source.
- CI calculations with relativistic corrections were made for theoretical predictions.
- Atomic transitions for Ba V were identified to established new energy levels.
- Weighted oscillator strength (gf) and transition probabilities (gA) were calculated.

The fifth spectrum of barium (Ba V) has been investigated with the aid of experimental recordings made on a 3-m normal incidence vacuum spectrograph at the Antigonish laboratory (Canada) in the wavelength region 300-2080 Å using triggered spark as an excitation source. The spectral analysis has been extended considerably to include new configuration 5s25p36p in even parity configuration and, 5s25p36d and 5s25p37s in odd parity configuration. Previously reported levels of the ground configuration and three lowest excited configurations 5s5p5, 5s25p35d and 5s25p36s in Ba V have been confirmed and all the J≥4 unknown levels of 5s25p35d configuration have now been established through the identification of transitions from the levels of 5s25p36p configuration. All the levels of 5s25p36p configuration and thirty seven out of forty eight levels of the 5s25p36d and 5s25p37s configurations have now been established. A configuration interaction Hartree-Fock calculation supports the analysis.