Hyperfine structure of the 3d³4s4p ⁶G multiplet of atomic vanadium

The spectrum of atomic vanadium was recorded using high-resolution Fourier transform spectroscopy with optical bandpass filters in the wavelength range from 360 to 500 nm. Vanadium atoms are produced and excited in a hollow-cathode discharge. The main focus lies on the determination of the magnetic dipole hyperfine constants A of the lowest multiplet of odd parity, the ⁶G of the configuration 3d³4s4p, the hyperfine structure (HFS) of which was unknown to date. The HFS of the lines, connecting this multiplet with the multiplets 3d³4s5s ⁶F, 3d³4s4d ⁶H and 3d³4s4d ⁶G, was observed and analysed. New results are presented for all six levels belonging to 3d³4s4p ⁶G as well as for seven high-lying levels belonging to 3d³4s4d ⁶H and 3d³4s4d ⁶G. The experimental results for the lowest multiplet of odd parity are compared with calculated magnetic dipole hyperfine constants which were estimated using the effective-operator formalism in the pure LS coupling case.