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The Spectrum and Term Analysis of Singly-Ionized Manganese



Florence Liggins, J C. Pickering, Gillian Nave, Jacob W. Ward, Wan-U Lydia Tchang-Brillet


An extensive analysis of the Mn spectrum was carried out using high-resolution Fourier transform (FT) and grating spectroscopy of Mn-Ne and Mn-Ar hollow cathode discharge sources, over the range 82 nm to 5500 nm (1820 cm −1 to 121728 cm −1 ). Spectral wavelengths for a total of 6020 Mn II lines have been measured of which 1346 are obtained through FT spectroscopy. These wavelengths are given to at least an order of magnitude lower uncertainty than previous measurements. These lines were used to identify 6257 Mn II transitions and improve the values of 516 previously published energy levels with typical uncertainties of a few thousandths of a cm −1 . We have verified an additional 56 Mn II energy levels, previously established through observation of stellar spectra alone using our FT spectra. In addition, 28 new energy level values have been established by the classification of 285 newly observed Mn II lines.
Astrophysical Journal Supplement Series


atomic data, line:identification, line:profiles, methods:laboratory


Liggins, F. , Pickering, J. , Nave, G. , Ward, J. and Tchang-Brillet, W. (2021), The Spectrum and Term Analysis of Singly-Ionized Manganese, Astrophysical Journal Supplement Series, [online],, DOI:10.3847/1538-4365/abc75f, (Accessed April 14, 2024)
Created January 13, 2021, Updated October 12, 2021