J/A+AS/109/125        Photoionisation cross section              (Verner+, 1995)

Analytic fits for partial photoionization cross sections VERNER D.A., YAKOVLEV D.G. <Astron. Astrophys. Suppl. Ser. 109, 125 (1995)> =1995A&AS..109..125V 1995A&AS..109..125V (SIMBAD/NED Reference)
ADC_Keywords: Atomic physics Keywords: atomic data - atomic processes Contents: In this paper, we present a uniform, compact and complete set of fit parameters to the cross sections for all subshells of atoms and ions of the elements under study. The partial photoionisation cross sections σnl(E) will be described by the fitting formula (equation 1): σnl(E)=σ0xF(E/E0) (in Mb), F(y)=[(y-1)2+(yw)2]y-Q[1+sqr(y/ya)]-P, where n is the principal quantum number of the shell, l=0, 1, 2 (or s, p, d) is the subshell orbital quantum number, E is the photon energy in eV, y=E/E0; σ0, yw, ya and P are the fit parameters, and Q=5.5+l-0.5P. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1 75 1696 Fit parameters for partial photoionization cross sections -------------------------------------------------------------------------------- Byte-per-byte Description of file: table1 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Z Atomic number 4- 5 I2 --- N Number of electrons 7- 7 I1 --- n Principal quantum number of the shell 9- 9 I1 --- l Orbital quantum number of the subshell 11- 20 E10.4 eV E(th) Subshell ionization threshold energy 22- 31 E10.4 eV E(0) Fit parameter of equation 1 33- 42 E10.4 Mbarn sigma(0) Fit parameter of equation 1 44- 53 E10.4 --- y(a) Fit parameter of equation 1 55- 64 E10.4 --- P Fit parameter of equation 1 66- 75 E10.4 --- y(w) Fit parameter of equation 1 --------------------------------------------------------------------------------
(End) Patricia Bauer [CDS] 02-Sep-1994
The document above follows the rules of the Standard Description for Astronomical Catalogues; from this documentation it is possible to generate f77 program to load files into arrays or line by line