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J/A+AS/137/157      O III recombination coefficients         (Kisielius+, 1999)
Recombination coefficients for the 5g-4f transitions of O III
at nebular temperatures and densities
       Kisielius R., Storey P.J.
      <Astron. Astrophys. Suppl. Ser. 137, 157 (1999)>
      =1999A&AS..137..157K      (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Planetary nebulae

Keywords: atomic data - line: formation - ISM: H II regions -
          ISM: planetary nebulae: general

Abstract:
    We calculate effective recombination coefficients for the formation of
    the 5g-4f lines of O III in the intermediate coupling scheme.
    Photoionization data for the 5g levels calculated using the R-matrix
    method are used to derive their recombination coefficients. Cascading
    from higher states is included, allowing for the effects of finite
    electron density in a hydrogenic approximation. We explicitly include
    the distribution of population between the two ground levels of O3+
    in the calculation of the line intensities. The results are presented
    as a simple programmable formula allowing the calculation of
    recombination line intensities for electron temperatures, Te in the
    range 5000-20000K and electron densities, Ne in the range
    102-106cm-3.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        64       24   Indices n1 and energy levels of the 4f and 5g
                                 states in O2+ ions
table2.dat        41       83   Wavelengths in air, electric dipole transition
                                 probabilities A(n1,n2) and branching ratios
                                 b(n1,n2) for the 5g-4f transitions in O2+
                                 ions
table3.dat        67       12   Fitting  coefficients for the direct
                                 recombination coefficients adir to the
                                 5g levels of O2+
table4.dat        20       12   Fractions of the cascade contributions from
                                 each series to the recombination coefficients
                                 of the 5g levels of O2+
table5.dat        47       12   Calculated and fitted effective recombination
                                 coefficients for the 5g levels of O2+ at the
                                 electron temperatures T=10000K and T=20000K
                                 and the electron density N=103cm-3.


See also:
  J/A+AS/133/257 : Recombination coefficients for NeII lines (Kisielius+ 1998)
  J/A+AS/135/359 : HI and HeII fine structure components (Clegg+ 1999)
  J/A+AS/142/85  : Recombination coefficients for C II lines (Davey+, 2000)
  J/A+A/387/1135 : NII effective recombination coefficients (Kisielius+, 2002)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     n1        Level index
   5-  6  A2    ---     Term      Term of parent level
   8- 10  A3    ---     J0        J of parent level
  13- 14  A2    ---     nl        outer electron in spectroscopic notation
      17  I1    ---     S         2S+1 of level
      19  A1    ---     L         L of level
      21  I1    ---     J         J of level
  25- 32  A8    ---     LK        Experimental level assignment
      34  I1    ---     Jb        J of level
  35- 44  F10.1 cm-1    Exp       Experimental level energy (1)
  45- 54  F10.1 cm-1    SS        Theoretical level energy from SUPERSTRUCTURE
                                    calculation
  55- 64  F10.1 cm-1    RM        Theoretical level energy from R-matrix
                                    calculation

Note (1): Experimental energy data are from Pettersson (Pettersson, Physica
           Scripta, 1982, 26, 296) while theoretical values are from
           SUPERSTRUCTURE (SS) and an R-matrix (RM) calculation. We also give
           our theoretical (SS) and previous experimental (Moore, 1970,
           "Atomic Energy Levels", NBS) level assignments.


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     n1        Index of upper level (1)
   5-  7  I3    ---     n2        Index of lower level (1)
  10- 18  F9.3  0.1nm   Lambda    Wavelengths (air)
  21- 29  E9.2  s-1     A(n1,n2)  Dipole transition probability between upper
                                   and lower levels
  32- 41  E10.3 ---     b(n1,n2)  Transition branching ratio

Note (1): The indices n1 and n2 correspond to the energy level indices
           in table 1.


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     n1        Index of upper level
   4- 11  F8.4  ---     a1        Fitting coefficient a1
  12- 19  F8.4  ---     b1        Fitting coefficient b1
  20- 27  F8.4  ---     c1        Fitting coefficient c1
  28- 35  F8.4  ---     d1        Fitting coefficient d1
  36- 43  F8.4  ---     a2        Fitting coefficient a2
  44- 51  F8.4  ---     b2        Fitting coefficient b2
  52- 59  F8.4  ---     c2        Fitting coefficient c2
  60- 67  F8.4  ---     d2        Fitting coefficient d2


Byte-by-byte Description of file: table4.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     n1        Index of upper level (1)
   3- 11  F9.5  ---     g1c       Fraction of cascade contribution from the
                                   first series
  12- 20  F9.5  ---     g2c       Fraction of cascade contribution from the
                                   second series

Note (1): Indices n1 correspond to the energy level indices from table 1.



Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

   2-  3  I2    ---     n1        Index of upper level (1)
   6- 14  E9.3 10-12cm3/s acal1   T=10000K calculated recombination coefficient
  17- 25  E9.3 10-12cm3/s afit1   T=10000K fitted recombination coefficient
  28- 36  E9.3 10-12cm3/s acal2   T=20000K calculated recombination coefficient
  39- 47  E9.3 10-12cm3/s afit2   T=20000K fitted recombination coefficient

Note (1): Indices n1 correspond to the energy level indices from table 1.



Acknowledgements: Romas Kisielius 

(End)                                         Patricia Bauer [CDS]   27-Apr-1999