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The energy levels of the krypton atom, in all stages of ionization for which experimental data are available, have been compiled. No data has yet been published for Kr XI through Kr XVII. For H-like krypton very accurate· calculated level values are compiled. In all, data for 29 spectra are given. Experimental g-factors are included for Krl and Kr II. Calculated percentage compositions of levels are given for 12 ions. A value for the ionzation energy of each ion, either experimental or theoretical, is included.

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The energy levels of the copper atom, in all stages of ionization for which experimental data are available, have been compiled. Ionization energies, either experimental or theoretical, and experimental g-factors are given. Leading components of calculated eigenvectors are listed.

This is a revision of the compilation of energy levels of iron for all ionization stages made in 1975 by Reader and Sugar. New material has since been provided for all but two of these ions. The present compilation includes electron configurations, energy levels, term designations, calculated leading percentages for most ions, experimental g.values, and ionization energies.

A recent breakthrough in the analysis of Nd IV resulted in the establishment of 37 energy levels of the ground configuration 4f3. We report here the completion to all 41 levels of this configuration. Wavelength measurements extended to 2800 Å and in higher excitation conditions lead to the classification of 1426 lines involving the excited configurations 4f25d, 4f26p, 4f26s. Owing to configuration mixing between 5p64f26p and the core-excited 5p54f4, numerous 5p64f25d–5p54f4 transitions, normally dipole-forbidden, are observed. Altogether 111 odd parity levels and 121 even parity ones have been established. Their parametric least-squares fits have rms deviations of 91 cm−1 and 37 cm−1, respectively. The interaction 5p64f25d–5p54f35d has an impact on the 4f3–4f25d transition probabilities computed by means of the Cowan codes. Theoretical values of lifetimes are reported for all the even parity levels.

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.