Hyperfine structure studies of the odd-parity electronic levels of the terbium atom

• Published in: Journal of quantitative spectroscopy & radiative transfer Vol. 237; p. 106613
• Main Authors: Furmann, B., Stefańska, D., Chomski, M., Suski, M., Wilman, S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2019
• Subjects: Atomic structure; Hyperfine structure; Laser spectroscopy; Terbium; Hyperfine structure; Terbium; Atomic structure; Laser spectroscopy
• ISSN: 0022-4073; 1879-1352
• DOI: 10.1016/j.jqsrt.2019.106613

•The hyperfine structure of 73 spectral lines of the terbium atom was recorded by laser spectroscopy in a hollow cathode discharge lamp.•The hyperfine structure constants A and B for 43 odd-parity levels were determined on the basis of laser spectroscopic investigations (among them, 41 for the first time).•For two odd-parity levels improved values of A and B constants were obtained in this work.•Additionally, the values of the hfs constants for two even-parity levels were slightly corrected.•The new hfs constants for the odd-parity levels may facilitate a semi-empirical analysis of the odd-parity level system of the terbium atom. In this work the hyperfine structure of 43 odd-parity levels of the terbium atom was investigated with the method of laser induced fluorescence in a hollow cathode discharge. Altogether 73 spectral lines were examined, with the odd-parity levels involved as the upper levels. For 41 levels the constants A and B were determined for the first time, and for the remaining two levels improved values could be obtained due to the supplementary measurements performed. As a by-product, also the hyperfine structure constants for two lower even-parity levels could be corrected. The obtained results concerning the odd-parity levels contributed to considerable extension of the available database of the hyperfine structure constants for the atomic terbium; they would be included in the semi-empirical analysis of the fine and the hyperfine structure for the odd-parity configurations system, planned in our research group.