Doppler limited laser spectroscopy on hafnium lines. Part I: Hyperfine structure of even-parity levels

Abstract:

High-resolution Doppler limited hyperfine structure investigations done by laser spectroscopy techniques using laser induced fluorescence and optogalvanic detection are performed in the plasma of a liquid nitrogen cooled hollow cathode discharge in the atomic spectrum of Hafnium on selected lines in the red spectral region. Hyperfine structure spectra obtained using an enriched sample of ¹⁷⁷Hf yielded hyperfine structure constants A and B of both transition levels. For the first time, an experimentally derived description of the levels of the 5d^36s configuration are presented. Combined with previously obtained data, the hyperfine structure of altogether 12 fine structure levels has been analysed by the simultaneous parametrisation of the one- and two-body interactions in the atomic hyperfine structure for the model space (5d + 6s)⁴.The radial parameters of the magnetic dipole and electric quadrupole interactions are determined for the configurations 5d ²6s ², 5d^36s and 5d⁴ and compared with ab initio calculations. Finally a complete list of the predicted hyperfine structure constants A and B of all levels of the system was generated.