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    Experimental investigation of the hyperfine structure of Tm I with Fourier transform spectroscopy part b: In the NIR wavelength range from 700 nm to 2250 nm
    (PERGAMON-ELSEVIER SCIENCE, 2022) Kebapçı, Taha Yusuf; Sert, Sami; Parlatan, Şeyma; Öztürk, İpek Kanat; Başar, Gönül; Başar, Günay; Tamanis, Maris; Kroger, Sophie
    In this study, we investigated the hyperfine structure of 43 spectral lines of atomic thulium. We analyzed Fourier-transform spectra in the wavelength range from 700 nm to 2250 nm, which corresponds to the wavenumber range from 14300 cm(-1) to 4440 cm(-1), respectively. The excited thulium atoms were generated in a hollow-cathode lamp. As a result of this investigation, the magnetic-dipole hyperfine constant A of 17 fine structure levels have been determined experimentally, 14 of them for the first time. The magnetic-dipole hyperfine constant values of the three remaining levels, reported in the literature, differed significantly from the results of our determination. (C) 2022 Elsevier Ltd. All rights reserved.