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Öğe Experimental investigation of the hyperfine structure of Tm I with Fourier transform spectroscopy, part A: In the visible wavelength range (400–700 nm)(Elsevier, 2022) Parlatan, Şeyma; Öztürk, İpek Kanat; Başar, Gönül; Başar, Günay; Ferber, Ruvin; Kroger, SophieThe spectra emitted by a thulium hollow-cathode discharge lamp with argon or neon as inert gases have been recorded with a Bruker IFS 125 HR fourier transform spectrometer in the visible wavelength region from 400 to 700 nm. The paper presents the investigation of the hyperfine-structure splitting of 50 spectral lines of neutral thulium. As a result, the magnetic dipole hyperfine structure constant A for 20 fine structure levels of Tm I have been determined for the first time. © 2022 Elsevier LtdÖğe Hyperfine structure investigation of singly Ionized thulium in fourier-transform spectra(IOP publishing, 2024) Kebapçı, Taha Yusuf; Parlatan, Şeyma; Sert, Sami; Öztürk, İpek Kanat; Başar, Gönül; Şahin, Timur; Bilir, Selçuk; Ferber, Ruvin; Tamanis, Maris; Kroger, SophieThe hyperfine structure of 40 spectral lines of singly ionized thulium (Tm ii) in emission spectra from a hollow cathode discharge lamp measured with a Fourier transform spectrometer in the wavelength range from 335 to 2345 nm has been investigated. As a result of the analysis, the magnetic dipole hyperfine structure constants A for 27 fine structure levels of Tm ii were determined for the first time. In addition, the values of two magnetic dipole hyperfine structure constants A from the literature were declared incorrect, and the corrected values were given.