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The Spectrum and Term Analysis of Co III Measured using Fourier Transform and Grating Spectroscopy



D. G. Smillie, J C. Pickering, Gillian Nave, P. L. Smith


The spectrum of Co III has been recorded in the region 1562 Å to 2564 Å 64000 cm-1 to 39 000 cm-1 by Fourier transform (FT) spectroscopy, and in the region 1317 Å to 2500 Å (164 000 cm-1 to 40 000 cm-1) using a 10.7 m grating spectrograph with phosphor image plate detectors. The spectrum was excited in a cobalt-neon Penning discharge lamp. Classified lines include: 513 Co III lines measured using FT spectroscopy, the strongest having wavenumber uncertainties approaching 0.004 cm-1 (approximately 0.2 mÅ at 2000 Å, or 1 part in 107); and 240 lines measured with grating spectroscopy with uncertainties between 5 mÅ and 10 mÅ. All but one of the 288 previously reported energy levels, have been revised with improvements in accuracy, including order of magnitude reductions in uncertainty for almost two thirds of the 3d64s and almost half of the 3d64p revised energy levels. Ritz wavelengths have been calculated for an additional 885 allowed lines and 98 forbidden lines from previous publications. Eigenvector percentage compositions for the energy levels and predicted oscillator strengths have been calculated using the Cowan Code.
Astrophysical Journal Supplement Series


Atomic data, Methods: laboratory, Wavelengths, Energy levels, Classified lines


Smillie, D. , Pickering, J. , Nave, G. and Smith, P. (2010), The Spectrum and Term Analysis of Co III Measured using Fourier Transform and Grating Spectroscopy, Astrophysical Journal Supplement Series, [online], (Accessed July 13, 2024)


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Created March 29, 2010, Updated October 12, 2021