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J/ApJS/74/291           Relativistic Free-Free Gaunt Factor. II.    (Itoh+ 1990)
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Relativistic Free-Free Gaunt Factor of the Dense High-Temperature Stellar
Plasma. II. Carbon and Oxygen Plasmas
     Itoh N., Kojo K., Nakagawa M.
    <Astrophys. J. Suppl. Ser. 74, 291 (1990)>
    =1990ApJS...74..291I
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ADC_Keywords: Atomic physics ; Opacities
Keywords: atomic processes - opacities - plasmas - relativity

Abstract:
    The pure Coulomb free-free Gaunt factors of the dense high-temperature
    carbon and oxygen plasmas are calculated by using the accurate
    relativistic cross section and are compared with the Gaunt factors
    derived by using Sommerfeld's exact nonrelativistic cross section. A
    wide range of electron degeneracy is accurately taken into account.
    Effects from resonances in the free electron density of states are not
    included. Dramatic deviations from the nonrelativistic results are
    found for high-temperature cases. Results are presented in the form of
    extensive tables to facilitate applications.

File Summary:
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 FileName     Lrecl     Records     Explanations
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ReadMe           80           .     This file
table1.dat      117         120    *<<g_ff>>, degeneracy parameter {eta}=-6.0
table2.dat      117         120     <<g_ff>>, degeneracy parameter {eta}=-2.0
table3.dat      117         120     <<g_ff>>, degeneracy parameter {eta}= 0.0
table4.dat      117         120     <<g_ff>>, degeneracy parameter {eta}= 1.0
table5.dat      117         120     <<g_ff>>, degeneracy parameter {eta}= 2.0
table6.dat      117         120     <<g_ff>>, degeneracy parameter {eta}= 3.0
table7.dat      117         120     <<g_ff>>, degeneracy parameter {eta}= 5.0
table8.dat      117         120     <<g_ff>>, degeneracy parameter {eta}=10.0
table9.dat      117         120     <<g_ff>>, degeneracy parameter {eta}=20.0
table10.dat     117         120     <<g_ff>>, degeneracy parameter {eta}=40.0
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Note on table1.dat: <<g_ff>> is the exact nonrelativistic free-free Gaunt factor
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See also:
   J/ApJS/63/661 : Relativistic Free-Free Gaunt Factor (Nakagawa+ 1987)
   J/ApJ/382/636 : Rosseland mean free-free Gaunt factor (Itoh+ 1991)

Byte-by-byte Description of file: table*.dat
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   Bytes Format  Units       Label      Explanations
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   1-  4  F4.1   ---         Logu      *Log u, u=(h_bar_*{omega})/kT
   6-  7  A2     ---         Elem      *Element for Gaunt factor calculation
  10- 18  E9.3   ---         G-4.0      ? Gaunt factor, log({gamma}^2^)= -4.0
  21- 29  E9.3   ---         G-3.5      ? Gaunt factor, log({gamma}^2^)= -3.5
  32- 40  E9.3   ---         G-3.0      ? Gaunt factor, log({gamma}^2^)= -3.0
  43- 51  E9.3   ---         G-2.5      ? Gaunt factor, log({gamma}^2^)= -2.5
  54- 62  E9.3   ---         G-2.0      ? Gaunt factor, log({gamma}^2^)= -2.0
  65- 73  E9.3   ---         G-1.5      ? Gaunt factor, log({gamma}^2^)= -1.5
  76- 84  E9.3   ---         G-1.0      ? Gaunt factor, log({gamma}^2^)= -1.0
  87- 95  E9.3   ---         G-0.5      ? Gaunt factor, log({gamma}^2^)= -0.5
  98-106  E9.3   ---         G+0.0      ? Gaunt factor, log({gamma}^2^)=  0.0
 109-117  E9.3   ---         G+0.5      ? Gaunt factor, log({gamma}^2^)=  0.5
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Note on Logu:
  Log u, where u=(h_bar_*{omega})/kT, and {omega} is the angular
  frequency of the absorbed photon.

Note on Elem:
  The free-free Gaunt factor was calculated for the following:
        H  - thermally averaged relativistic carbon
        He - thermally averaged relativistic oxygen
        G  - thermally averaged nonrelativistic free-free Gaunt factor
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Origin: AAS CD-ROM series, Volume 9, 1997        Lee E. Brotzman [ADS] 28-Aug-97
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(End)                                                         [CDS]  06-Feb-1998