Hyperfine structure measurements of neutral niobium with Fourier transform spectroscopy

Kröger, S.; Er, A.; Öztürk, I. K.; Başar, Günay; Jarmola, Andrey; Ferber, R.; Tamanis, M.; Začs, L.

doi:10.1051/0004-6361/200913922

Cited by 21 publications

(23 citation statements)

References 21 publications

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“…We here continue our earlier systematic investigations of the spectrum of Nb I Kröger et al 2004Kröger et al , 2007Kröger et al , 2010Başar et al 2008;Er et al 2011). Our purpose is to supplement hyperfine structure (hfs) data for this element, in particular, to fill gaps for all energy levels of even parity with unknown hyperfine structure (hfs) constants.…”

Section: Introductionmentioning

confidence: 52%

“…t.w. : this work; (1) Fraenkel et al (1988); (2) Er et al (2011); (3) Bouzed et al (2003); (4) Başar et al (2008); (5) Kröger et al (2010). Notes.…”

Section: Hyperfine Structure Analysismentioning

confidence: 99%

“…The astrophysical interest of Nb hfs data was already extensively discussed in Kröger et al (2010). A lot of work has already been done over the past 35 years to investigate the hfs of Nb using various spectroscopic methods.…”

Section: Introductionmentioning

confidence: 99%

“…Other high-resolution measurements have been made by Fraenkel et al (1988) using laser and radio-frequency spectroscopy, and by some of us (Başar et al 2008), using Doppler-reduced saturation absorption spectroscopy. Doppler-limited measurements of hfs constants have been made using Fourier transform spectroscopy (Kröger et al 2010;Er et al 2011) and Doppler-limited laser spectroscopic methods (Singh & Rao 1989;Singh et al 1992;Bouzed et al 2003;Kröger 2007). In addition to the experimental investigations, a theoretical analysis of hfs of atomic Nb has been performed by , , and Kröger et al (2007).…”

Section: Introductionmentioning

confidence: 99%

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Hyperfine structure investigations of atomic niobium with optogalvanic and laser-induced fluorescence spectroscopy in the near-infrared wavelength range

Başar

Öztürk

et al. 2013

A&A

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Aims. The aim of this work is to increase the amount of hyperfine structure data of atomic niobium (Nb I), which is needed for astrophysicists for the detailed analysis of new stellar spectra. Particular emphasis was placed on the investigation of energy levels with unknown hyperfine structure constants. Methods. The hyperfine structure in the spectrum of Nb I was studied using laser-induced fluorescence spectroscopy and laser optogalvanic spectroscopy with a tuneable single-mode cw Ti:Sa laser in the wavelength range from 750 nm to 865 nm. The Nb atoms were produced and excited in a liquid-nitrogen-cooled hollow-cathode plasma. Results. We measured and analysed 81 spectral lines, 19 of which are not previously known from the literature. In total, the magnetic dipole hyperfine structure constants A were determined for 28 energy levels of even and 53 energy levels of odd parity. The electric quadrupole hyperfine structure constants B were only determined in a few cases, when the spectra were clearly resolved and/or when a level was found from several transitions. The magnetic dipole hyperfine structure constants A of 13 even and 11 odd levels as well as the electric quadrupole hyperfine structure constants B of 13 even and 17 odd levels are presented for the first time. For the other levels, improved values of hyperfine structure constants are given. Conclusions. The hyperfine structure can have a significant effect on stellar absorption line profiles, and the corresponding abundances can be substantially overestimated if these effects are not taken into account. Therefore, a detailed consideration of the hyperfine structure is important for stellar abundance determinations. The present work substantially increases the knowledge of hyperfine structure of Nb, which plays an important role in investigating the nucleosynthesis of heavy elements.

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Section: Introductionmentioning

confidence: 52%

“…t.w. : this work; (1) Fraenkel et al (1988); (2) Er et al (2011); (3) Bouzed et al (2003); (4) Başar et al (2008); (5) Kröger et al (2010). Notes.…”

Section: Hyperfine Structure Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hyperfine structure investigations of atomic niobium with optogalvanic and laser-induced fluorescence spectroscopy in the near-infrared wavelength range

Başar

Öztürk

et al. 2013

A&A

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“…Niobium has only one naturally abundant isotope, 93 Nb and it has the largest nuclear magnetic dipole moment among the stable nuclei. Thus the atomic levels of Nb have a broad hyperfine splitting [13,14]. As the frequency spread (1/Δτ $ 100 MHz) corresponding to the duration of the excitation pulse cannot cover the large hyperfine splitting, which is of the order of few hundreds of MHz, pairs of nondegenerate magnetic sublevels cannot be coherently excited [15].…”

Section: Measurements and Resultsmentioning

confidence: 99%