Abstract.
Transition isotope shifts of 3s–3p transitions in Ne II and Ne III are measured in Fourier transform spectra from a hollow-cathode source. Accurate absolute line-center positions of the 20Ne isotope are derived for the purpose of tertiary wavelength standards in the region 2000–5000 Å. A robust statistical treatment is applied, yielding line-position uncertainties that are lower than for the Ar II secondary standards used as references. The influence of Stark shifts on both the new Ne II standards and the Ar II standards is also investigated. In addition, improved wavenumbers of the 3p–3d and 3p–4s transitions are presented, of which 12 in Ne II have been measured for the first time.
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Öberg, K. Isotope shifts and accurate wavelengths in Ne II and Ne III. Eur. Phys. J. D 41, 25–47 (2007). https://doi.org/10.1140/epjd/e2006-00193-0
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DOI: https://doi.org/10.1140/epjd/e2006-00193-0