Hyperfine structure measurements of neutral niobium with Fourier transform spectroscopy

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Table 1:

Nb I transitions investigated by means of Fourier transform spectroscopy.
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Notes. Wavelength in air $\lambda_{\rm air}$ , wavenumbers $\tilde{\nu}$ , intensities, and level energies E according to Humphreys & Meggers (1945), centre of gravity $\tilde{\nu}_{\rm fit}$ resulting from the hyperfine structure fit and $\Delta \tilde{\nu} = E_u - E_l -\tilde{\nu}_{\rm fit}$ .
$^{(\dag )}$ Wrong classification given in Humphreys & Meggers (1945); ^(*) FWHM and ratio between Gaussian and Lorentzian FWHM fixed during the fit; r: self-reversal line; c: complex line; d: double line.

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