Atomic Data for Resonance Absorption Lines. II. Wavelengths Longward of the Lyman Limit for Heavy Elements

This compilation extends the 1991 listing of atomic data by Morton to the heavier stable elements from germanium to bismuth. Technetium, thorium, and uranium are added because they can live long enough to be astrophysically detectable. The tabulation emphasizes resonance lines, i.e., lines the lower level of which is the ground state, or an excited fine-structure state of the ground term, and is restricted to wavelengths longward of the H I Lyman limit at 911.75 Å. This paper has attempted to review all data published by mid-1999 and includes some later material.

     The tables contain the best data available to the author on level designations, ionization potentials, vacuum and air wavelengths, lower and upper energy levels, statistical weights, transition probabilities, natural damping constants (reciprocal lifetimes), oscillator strengths, and the often-used combinations of log gf and log λf. All ion stages with classified lines are included. Individual components resulting from isotope shift and hyperfine structure are listed explicitly for Rb I, Cs I, Hg I and Hg II, Ti II, and Pb II. The accompanying text provides references, explanations for the critical selection of data, and notes indicating where new measurements or calculations are needed.

     This compilation should be particularly useful in the analysis of interstellar and quasar absorption lines and other astrophysical sites where the density of particles and radiation is low enough to excite only the lowest atomic levels. The data also are relevant to the study of stellar atmospheres, particularly those with enhanced abundances of heavy elements.