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:
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File Name 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-per-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