This is a compilation of atomic lines with accurately known wavelengths covering the range from 15 Å to 25000 Å. The tables are a fairly complete record of available spectrum lines that meet the requirements for useful references with regard to wavelength accuracy and intensity. In general, wavelength uncertainties range from 0.0001 Å to 0.002 Å. Section 1, λ > 2000 Å, gives λair and λvac for 3341 lines belonging to thirteen different spectra of ten elements. Section 2, λ < 2000 Å, contains 2091 lines belonging to 59 different spectra of 28 elements. The lines of section 2 are listed both by spectrum (i.e. element and ionization stage) and in a finding list arranged in order of decreasing wavelength. Detailed explanations of the data and the sources used for the compilation are included.
An earlier analysis of the spectra of Ce XII, PI XIII, Nd XIV, and Sm XVI has been significantly expanded. Wavelengths are presented for the f i s t time for Eu XVII through Ho XXI. Spectra of Ce I1 through Ho XXI were obtained with a high voltage triggered spark and photographed on the NBS 10.7 m grazing incidence spectrograph. Observations of tungsten in the plasma of the Oak Ridge tokamak (ORMAK) were transmitted to us. Energy levels of configurations of the type 4d"nl and 4d94f are derived for each ion and for W XXVIII. Ionization energies are derived through Eu XVII by means of the ns series.
Observed and predicted wavelengths of magnetic dipole lines arising within ground configurations of the type ns2npk(n=2 and 3, k=1 to 5) are compiled. For n=2 the compilation includes the elements B through Kr, and for k=5 it extends to Mo. For n=3 Al through Mo are included. In addition the 2s2p excited configuration of the Be i isoelectronic sequence for Be through Kr and 3s3p of the Mg sequence for Mg through Mo are included. For each line we give a calculated value for the transition probability obtained mainly from the Dirac-Fock method or from the use of scaled radial integrals. The calculated wavelengths are obtained from known energy levels or from levels derived from scaled radial integrals. A small group of electric quadrupole lines seen in astronomical sources are included. The list contains 1660 predicted wavelengths in the range 100 Å to 25.9 mm and 406 observed wavelengths in the range 325 Å to 609 μm.
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