J. Phys. II France
Volume 2, Numéro 4, April 1992
Page(s) 913 - 929
DOI: 10.1051/jp2:1992175
J. Phys. II France 2 (1992) 913-929

Precision Fe I and Fe II wavelengths in the red and infra-red spectrum of the iron-neon hollow cathode lamp

G. Nave1, R.C.M. Learner1, J.E. Murray1, A.P. Thorne1 and J.W. Brault2

1  Blackett laboratory, Imperial College, London SW7 2BZ, G.B.
2  National Solar Observatory, P.O.Box 26732, Tucson, Az. 85726 U.S.A.

(Received 30 October 1991, accepted 17 January 1992)

Wavelengths and wavenumbers are presented for 290 lines in the spectrum of the Iron-Neon hollow cathode lamp. The lines are all strong, stable, well resolved lines in Fe I or Fe II; the range covered is from 424 nm to 4.2  $\mu$m (23600 to 2354  cm -1). The measurements were made by Fourier transform spectrometry with a wavenumber precision of $\pm 0.0003$ cm -1 or better. The absolute accuracy, based on visible region Ar II standards, varies from 0.001 cm -1 at 20000 cm -1 to 0.0005 cm -1 at 2300 cm -1. The absolute scale used is the same as that employed in earlier work, covering the range from 17350 to 55000 cm -1. The intensities, damping parameters (Lorentzian component of line profile) and observed signal to noise ratios of the lines are also tabulated. Auxiliary experiments showed that lines of large Doppler width or high damping parameter suffer significant wavenumber shifts; such lines have been excluded from the list. It is also shown that the wavenumbers of unbroadened lines are the same in large (950 mA, 4 mB) and small (20 mA, 10 mB) hollow cathode lamps.

06.20H - 07.50E/G - 32.20F/J

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