Spectral analysis of 5s25p2(6p+6d+7s) configurations of Ba VI

Abstract

The sixth spectrum of barium (Ba VI) has been investigated with the aid of experimental recordings made on a 3-m normal incidence vacuum spectrograph of Antigonish laboratory (Canada) in the wavelength region 300–2080Å using triggered spark as an excitation source. The spectral analysis has been extended considerably to include new configuration the 5s25p26p in odd parity matrix and the 5s25p26d and 5s25p27s configurations in even parity matrix. Previously reported levels of the ground configuration (5s25p3) and three lowest excited configurations the 5s5p4, 5s25p25d and 5s25p26s have been confirmed and the two unknown levels of the 5s25p25d configuration with J=9/2, have now been established through the identification of transitions from the 5s25p26p levels. All twenty one levels of the 5s25p26p configuration and twenty nine levels out of thirty six of the 5s25p26d and 5s25p27s configurations have now been established. Hartree–Fock calculations involving configuration interactions support the analyses. The accuracy of our wavelength measurement is ±0.005Å for sharp lines.