Identification of new electronic levels in the holmium atom and investigation of their hyperfine structure

• Published in: Journal of quantitative spectroscopy & radiative transfer Vol. 219; pp. 117 - 126
• Main Authors: Furmann, B., Stefanska, D., Suski, M., Wilman, S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2018
• Subjects: Atomic structure; Holmium; Hyperfine structure; Laser spectroscopy; Hyperfine structure; Atomic structure; Holmium; Laser spectroscopy
• ISSN: 0022-4073; 1879-1352
• DOI: 10.1016/j.jqsrt.2018.08.005

•The procedure of the search for new electronic levels in the holmium atom (the main aim of the work) was described.•Hyperfine structure of 73 spectral lines was recorded with the method of laser induced fluorescence.•21 new odd-parity levels were found, and their energies and the hyperfine structure constants A and B were determined.•The existence of each level was verified by examination of a few laser-excited transitions, and recording of a few fluorescence channels.•New levels found may find their applications in the description of the interactions in the atom and in the metrological and quantum optics experiments. In this work the hyperfine structure of some tens of unclassified spectral lines in the holmium atom was investigated with the method of laser induced fluorescence in a hollow cathode discharge lamp. As a result, 21 new electronic odd-parity levels, with previously unknown energies within the range 33000–42000 cm−1, were identified and their hyperfine structure constants A and B were determined. The experimental data obtained will facilitate the semi-empirical fit of the fine and hyperfine structure of the odd-parity level system for the atomic holmium, currently in progress in our group.