blike_jl96#ar13j.dat

• Spontaneous Emission: Ar⁺¹³(i) → Ar⁺¹³(j) + hv
• Electron Impact Excitation: Ar⁺¹³(i) + e → Ar⁺¹³(j) + e

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 ENERGY LEVELS AND IONISATION POTENTIAL
 The ionisation potential is from Kelly (J Phys Chem Ref Data 16, 
 Suppl 1, 1987). The energies are from Edlen (Phys Scripta 28, 483, 
 1983). The ordering of the levels is as given in the work used for 
 the effective collision strengths. There are major differences in 
 energy levels with the data from the NIST discs, as shown in the
 following table:

 ===============================================================
                                           Edlen        NIST 
 ---------------------------------------------------------------
   1 2s2.2p            (2)1(  .5)               .0          0.  
   2 2s2.2p            (2)1( 1.5)          22653.0      22657.  
   3 2s.2p2            (4)1(  .5)         229299.0     196700.  
   4 2s.2p2            (4)1( 1.5)         237886.0     205310.  
   5 2s.2p2            (4)1( 2.5)         249376.0     216800.
   6 2s.2p2            (2)2( 1.5)         410124.0     410273.
   7 2s.2p2            (2)2( 2.5)         411084.0     411200.
   8 2s.2p2            (2)0(  .5)         514414.0     514430.
   9 2s.2p2            (2)1(  .5)         545109.0     545230.
  10 2s.2p2            (2)1( 1.5)         554656.0     554660.
  11 2p3               (4)0( 1.5)         717895.0     685360.
  12 2p3               (2)2( 1.5)         810913.0     780400. 
  13 2p3               (2)2( 2.5)         812807.0     783100.
  14 2p3               (2)1(  .5)         908573.0     881200.
  15 2p3               (2)1( 1.5)         912906.0     885700.
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 TRANSITION PROBABILITIES
 For the transition between the 1/2 and 3/2 levels of the ground term 
 the multiconfiguration Hartree-Fock Breit-Pauli result of C Froese 
 Fischer (J Phys B 16, 157 1983) is used (105 s-1). The
 multiconfiguration Dirac-Fock calculations of Cheng, Kim and 
 Desclaux (ADNDT 24, 111, 1979) yielded 106 s-1. The calculations
 by Dere et al (Ap J SS 40, 341, 1979) and by Bhatia, Feldman and 
 Seely (ADNDT 35, 319, 1986) gave 99.2 and 107 s-1 respectively.

 The results of Merkelis et al (Phys Scripta 51, 233, 1995) were 
 adopted for other ions in this sequence (Mg to Fe inclusively).
 They did not publish results for Ar XIV.  They stated that their
 transition probabilities for the allowed E1 transitions are 
 close to those obtained by Cheng, Kim and Desclaux by the MCDF
 method or by Dankwort and Trefftz (Astron Astrophys 65, 93, 1978)
 by the MCHF method. The results published by Dankwort and Trefftz
 and Dere et al do not include transitions involving the 2p3 levels.
 The results of Cheng et al are used here. Their results differ from 
 those of Bhatia et al by more than about 20% in 5 cases (3-14, 3-15,
 4-12, 4-13, 8-14 and 9-15.

 EFFECTIVE COLLISION STRENGTHS
 In their assessment of effective collision strengths for the B-like 
 sequence Sampson, Zhang and Fontes (ADNDT 57, 98, 1994) review the 
 available results. No close coupling results were then available
 for this ion. However, Sampson et al anticipated the R-matrix close
 coupling calculations of Zhang, Graziana and Pradhan (Astron 
 Astrophys 283, 319,1994) for the 105 fine structure transitions 
 among the 15 levels of the 2s2 2p, 2s 2p2 and 2p3 configurations.
 These results are adopted here. The data were obtained 
 electronically and processed into ADF04 format.

 J Lang
 A Lanzafame         May 1996
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Contributors

• Jim Lang
• K P Dere
• Hong Zhang
• Douglas Sampson
• Alessandro Lanzafame