belike_jl95#n.dat

• Spontaneous Emission: N⁺³(i) → N⁺³(j) + hv
• Electron Impact Excitation: N⁺³(i) + e → N⁺³(j) + e

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   Energy Levels
   The results from NSRDS NBS3 SECT 9 were used. These were within 2
   wavenumbers of the results of Edlen (Phys. Scr 32, 86, 1985 and
   28, 51, 1983) who only considered n=2 levels. The NSRDS values are
   also those of Moore and Gallacher "Tables of Spectra of hydrogen,
   carbon, nitrogen and oxygen atoms and ions" CRC press 1993.

   Ionisation Potential
   As energy levels.

   A Values
   For transitions between n = 2 levels the results of the compilation
   by Allard et al (Astron Astrophys Suppl Ser 84, 563, 1990) were used
   and for values not given by them the results of Nussbaumer and Storey
   (Astron Astrophys 74, 244, 1979) were used. The Nusssbaumer and Storey
   results were adopted for forbidden transitions by Allard et al.
   For the 2-3 and 3-4 transitions the results of Idrees and Das (J Phys B
   22, 3609, 1989 were used.
   For transitions involving n = 3 levels again the results of Allard et al
   were adopted.

   Collision Data
   The results of Ramsbottom et al (Phys Scr 50, 246-253 1994) were adopted.
   These results were obtained from a 12 eigenstate R-matrix calculation. The
   12 states correpond to the 20 lowest finestructure levels. The partial wave
   expansion was for total angular momentum l <= 12 for both odd and even
   parities and doublet and quartet spin states. For allowed transitions
   the partial wave analysis was extended beyond 12.  The transformation
   from LS to JJ coupling was by a program from Saraph (Comp Phys Comm
   15, 247, 1978) which ignores term coupling and included the higher partial
   waves.
   In processing these data through ADAS 102 some obvious misprints in the
   paper were found. In Table VI transition 65 should have upper level 2s3p
   1P not 2P. In Table VII transition 8 the second last temperature value
   should be to power -1 and transition 50 the last 3 temperature values
   should be to power +1 not -1. For the allowed transition 27, the effective
   collision strength falls with temperature although others rise.
   Similarly with transition 53. The allowed behaviour was forced by ADAS 101.
   The allowed members of the 2p2 3P - 2s3p 3P transition all have effective
   collision strengths which fall with increasing temperature. The allowed
   behaviour was forced by ADAS 101, making a difference of eg 6.36 10-3 to
   6.67 10-3 at the highest temperature in this file for the  0-1 transition.
   Note that Ramsbottom et al did not give A values for this transition.
   In CIII and O V in similar calculations this double electron jump
   transition was presented in the same way.  Also the type 1 behaviour was
   forced for transition 94.
   For allowed transitions between n=3 levels IPProg was used to generate
   the collision strengths using the enery levels and A values adopted here.

   J LANG    May 1995.
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Contributors

• Jim Lang
• K P Dere