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J/A+AS/109/125                     Photoionisation cross section (Verner+, 1995)
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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)
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ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes

Abstract:
       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
       {sigma}_nl_(E) will be described by the fitting formula (equation 1):
       {sigma}_nl_(E)={sigma}_0_xF(E/E_0_) (in Mb),
       F(y)=[(y-1)^2^+(y_w_)^2^]y^-Q^[1+sqr(y/y_a_)]^-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/E_0_; {sigma}_0_, y_w_, y_a_ and P are the fit
       parameters, and Q=5.5+l-0.5P.

File Summary:
--------------------------------------------------------------------------------
 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table1          75       1696    Fit parameters for partial photoionization
                                  cross sections
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Byte-by-byte Description of file: table1
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   Bytes Format  Units   Label        Explanations
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   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
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(End)                                           Patricia Bauer [CDS] 02-Sep-1994