Revised and extended analysis of Br VI

The spectrum of five times ionized bromine (Br VI) has been studied in the 150-2060 Å wavelength region. The spectrum was recorded on a 3-m normal incidence vacuum spectrograph at the Antigonish laboratory (Canada) and 6.65-m grazing incidence spectrograph at the Zeeman laboratory (Amsterdam) using a triggered spark light source. The ground configuration of Br VI is 3d104s2 and the excited configurations 3d104s (4p+5p+6p+7p+4f+5f)+3d104p4d+3d104p5s in the odd parity system and 3d104s (4d+5d+6d+5s+6s+7s+8s+5g+6g)+3d104p2 in the even parity system have been studied. Relativistic Hartree-Fock (HFR) and least squares fitted (LSF) parametric calculations were used to interpret the observed spectrum. Sixty-eight levels of Br VI have now been established, out of which 28 are new levels. Two previously reported levels viz. 4p4d 1D2 and 3F4 were revised. Among one hundred and fifty-eight spectral lines, 69 are newly classified. The accuracy of our wavelength measurements for sharp and unblended lines is ±0.005 Å. The value of the ionization potential has been determined as 704850±200 cm−1 (87.390±0.025 eV).

► The spectrum of Br was recorded on a 3-m spectrograph with triggered spark source. ► Atomic transitions for Br VI were identified to established new energy levels. ► CI calculations with relativistic corrections were made for theoretical predictions. ► Weighted oscillator strength (gf) & transition probabilities (gA) were calculated. ► Ionization potential of Br VI was determined experimentally.