A NEW MULTIPLET TABLE FOR FE-I

We have recorded spectra of iron-neon and iron-argon hollow cathode la mps in the region 1700 angstrom-5 mum (59,000-2000 cm-1), with Fourier transform (FT) spectrometers at the National Solar Observatory, Tucso n, Arizona, and Imperial College, London, UK, and with a high-resoluti on grating spectrograph at the National Institute of Standards and Tec hnology, Gaithersburg, Maryland. The uncertainty of the strongest line s in the FT spectra is less than 0.002 cm-1 (0.2 mangstrom at 3000 ang strom; 8 mangstrom at 2 mum). Pressure- and current-dependent shifts a re less than 0.001 cm-1 for transitions between low-lying levels, incr easing to 0.006 cm-1 for transitions between the most highly excited l evels. We report 28 new energy levels of Fe I and revised values of an other 818 levels. We have identified 9501 lines as due to 9759 transit ions in Fe I, and these are presented in the form of a new multiplet t able and finding list. This compares with the approximately 5500 lines due to 467 energy levels in the multiplet tables of Moore (1950, 1959 ). The biggest increase is in the near-ultraviolet and near infrared, and many of the new lines are present in the solar spectrum. Experimen tal log (gf) values are included where they are available. A further 1 25 unidentified lines due to Fe I are given. The tables are also avail able in computer-readable form.