Photoionization cross sections calculated by the scaled Thomas-Fermi method (hv ≤ 50 eV)☆

Abstract Photoionization cross sections have been calculated by means of scaled Thomas-Fermi methods for atoms and ions of special astrophysical interest. The energy of the ejected electron ranges from 0 to 3 Ry. The photon energies hv are ≤ 50 eV, corresponding to λ ≥ 200 A. Results are available in tables for all states with n ≤ 10, l ≤ 3 for the following atoms and ions: He I, Li I, Be I, C I–IV, N I–V, O I–III, Ne I–II, Na I–II, Mg I–II, Al I–II, Si I–IV, S I–II, Ar I–II, K I–II, Ca I–II, Kr I–II, Rb I, Sr I, Xe I, Cs I, Ba I. Furthermore, tables of the thermal absorption coefficients of these atoms and ions have been calculated. Presented here are the cross sections and absorption coefficients for C I, N I, and O I. Other results are available, on magnetic tape, from the authors.