Access to Astronomical Catalogues

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      (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:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1            75     1696   Fit parameters for partial photoionization
                                  cross sections


Byte-by-byte Description of file: table1

   Bytes Format  Units   Label        Explanations

   1-  2  I2     ---     Z            Atomic number
   4-  5  I2     ---     N            Number of electrons
       7  I1     ---     n            Principal quantum number of the shell
       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