Investigation of Transitions to the Atomic Ground State in Fourier Transform Spectra of Holmium

Abstract

The aim of this study was to investigate in more detail some previously published atomic holmium energy levels, which were previously only published with very imprecise values for the level energy 𝐸 and without total angular momentum quantum number 𝐽. By analysing Fourier Transform (FT) spectra in the 317 nm-1750 nm wavelength range using hyperfine structure as a diagnostic tool, we sought to enhance the precision of energy measurements and determine the unknown 𝐽 values. All levels investigated were initially identified through their transitions to the ground state. We have investigated this transition and, if possible, other additional spectral lines that were classified as transitions to the investigated levels. A total of 13 lines from the FT spectra were analysed leading to results for six energy levels. For these six levels a more precise determination of the energy values could be achieved. With the investigation of the hyperfine structure knowledge on their previously unknown 𝐽 values could be achieved. Furthermore, hyperfine structure constants of the investigated energy levels were determined for the first time.

Keywords

• laser spectroscopy
• fine structure
• hyperfine structure
• holmium

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