We report radiative transition probabilities for 5029 emission lines of neutral cerium within the wavelength range 417-1110 nm. Transition probabilities for only 4% of these lines have been previously measured. These results are obtained from a Boltzmann analysis of two high resolution Fourier transform emission spectra used in previous studies of cerium, obtained from the digital archives of the National Solar Observatory at Kitt Peak. The set of transition probabilities used for the Boltzmann analysis are those published by Lawler et al (2010 J. Phys. B: At. Mol. Opt. Phys. 43 085701). Comparisons of branching ratios and transition probabilities for lines common to the two spectra provide important self-consistency checks and test for the presence of self-absorption effects. Estimated 1 sigma uncertainties for our transition probability results range from 10% to 18%.

Atomic transition probabilities for 2874 lines of the first spectrum of cerium (Ce I) are reported. These data are from new branching fraction measurements on Fourier transform spectra normalized with previously reported radiative lifetimes from time-resolved laser-induced-fluorescence measurements (Den Hartog et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 085006). The wavelength range of the data set is from 360 to 1500 nm. Comparisons are made to previous investigations which are less extensive. Accurate Ce I transition probabilities are needed for lighting research and development on metal halide high-intensity discharge lamps.

The molecular beam electric resonance technique has been used to examine the hyperfine spectrum of RbF. The Rb nuclear electric quadrupole interaction, the spin-rotation interactions, and tensor and scalar spin-spin interactions have been measured for both Rb isotopes, including their dependence on vibrational and rotational states. Transition frequencies have been determined to a precision of better than 1 Hz in many cases. The magnetic interactions in the two isotopomers are consistent with what is expected from the known masses and magnetic dipole moments. In the case of the Rb nuclear electric quadrupole interaction, adjustments have been made for a small isotopomer shift, and for the ratio of the effective nuclear electric quadrupole moments, Q(87Rb)Q(85Rb) = 0.483 830 1+/-0.000 001 8. The effective quadrupole interaction includes a pseudoquadrupole interaction that may be significant at this level of precision, but cannot be distinguished experimentally.

A high-precision examination of the hyperfine spectrum of 6LiI in comparison with 7LiI shows a shift in the iodine nuclear electric quadrupole moment that cannot be accounted for by a model in which the electric field gradient at the iodine site is assumed to depend only upon the internuclear distance between Li and I. The other hyperfine interactions are consistent between the two isotopomers, including the previously reported electric hexadecapole interaction of the iodine nucleus.

We report the measurement of branching fractions and absolute transition probabilities for 103 Co I spectral lines in the wavelength range between 293 and 1008 nm. Hollow cathode spectra recorded using the Fourier transform spectrometer at the National Solar Observatory are used to determine the branching fractions. An absolute scale is established using recently reported radiative lifetimes from time-resolved laser-induced fluorescence measurements. The results are for the most part in agreement with previously reported measurements but reduce the uncertainties by an average factor of 2.5. Two-thirds of the transition probabilities reported here have uncertainties between ±5% and ±10%. The lines studied in this work connect the low-lying even-parity levels of Co I to odd-parity levels between 28346 and 34134 cm-1.

We report the measurement of 92 branching fractions and atomic transition probabilities in Ti I. High-current, hollow cathode spectra recorded using the Fourier transform spectrometer at the National Solar Observatory are used to determine the branching fractions. An absolute scale is established using recently reported radiative lifetimes from time-resolved laser induced fluorescence measurements. These 92 lines are connected to high-lying, even parity levels in neutral Ti. Most of our transition probabilities are accurate to better than ±10%.