Sulfur   -   Spectral Data for the Chandra X-ray Observatory

• S VIII   (Sulfur   Z = 16)

  F I isoelectronic sequence

  Ground state   1s²2s²2p^{5 2}P^°_3/2

  Ionization energy 2 651 500 cm^-1 (328.74 eV)

  Data are tabulated for 42 transitions in the range 47 Å to 85 Å. Because of breakdown of LS coupling for F-like ions, we mainly selected transition probabilities calculated with intermediate coupling. Mean values between MCHF [1] and CIV3 [2] results are given for the transition arrays 2s²2p⁵-2s²2p⁴3s, 2s²2p⁵-2s²2p⁴3d, and 2s2p⁶-2s²2p⁴3p. Remaining data were taken from calculations carried out with the Cowan relativistic Hartree-Fock program (HFR) by Fawcett [3].

    References

  1. G. Tachiev and C. Froese Fischer, The MCHF/MCDHF Collection (Downloaded 10 May 2002).
      
  2. H.M.S. Blackford, A. Hibbert, At. Data Nucl. Data Tables 58, 101 (1994).
      
  3. B.C. Fawcett, At. Data Nucl. Data Tables 36, 80 (1987).
     

   

   
• S IX   (Sulfur   Z = 16)

  O I isoelectronic sequence

  Ground state   1s²2s²2p^{4 3}P₂

  Ionization energy 3 061 300 cm^-1 (379.55 eV)

  Data are tabulated for 99 transitions in the range 38 Å to 171 Å. Transition probabilities for the 2s²2p⁴-2s²2p³3s, 2s²2p⁴-2s²2p³3d and 2s2p⁵-2p⁶ arrays are taken from MCHF [1] calculations. For four transitions from levels with n = 4 results are taken from the Opacity Project (OP) [2]. The multiplet values from OP have been decomposed into fine-structure components assuming LS-coupling, as indicated by the notation LS in the reference column.

    References

  1. G. Tachiev and C. Froese Fischer, The MCHF/MCDHF Collection (Downloaded 10 May 2002).
      
  2. NASA TIPTOPbase (Downloaded 23 August 1995).
     

   

   
• S X   (Sulfur   Z = 16)

  N I isoelectronic sequence

  Ground state   1s²2s²2p^{3 4}S°_3/2

  Ionization energy 3 609 000 cm^-1 (447.5 eV)

  Data are tabulated for 120 transitions in the range 34 Å to 167 Å. Transition probabilities for the 2s²2p³-2s²2p²3s, 2s²2p³-2s²2p²3d, 2s2p⁴-2s2p³(⁵S°)3s, 2p⁵-2s²2p²3s, and 2p⁵-2s²2p²3d arrays are taken from MCHF [1] calculations. Remaining results are taken from the Opacity Project (OP) [2]. The multiplet values from OP have been decomposed into fine-structure components assuming LS-coupling, as indicated by the notation LS in the reference column.

    References

  1. G. Tachiev and C. Froese Fischer, The MCHF/MCDHF Collection (Downloaded 10 May 2002).
      
  2. NASA TIPTOPbase (Downloaded 23 August 1995).
     

   

   
• S XI   (Sulfur   Z = 16)

  C I isoelectronic sequence

  Ground state   1s²2s²2p^{2 3}P₀

  Ionization energy   4 071 300 cm^-1 (504.8 eV)

  Data are tabulated for 116 transitions in the range 31 Å to 174 Å. Transition probabilities for the 2s²2p²-2s²2p3s, 2s²2p²-2s²2p3d, 2p⁴-2s²2p3s, and 2p⁴-2s²2p3d arrays are mean values from CIV3 [1] calculations. Values for the 2s2p³-2s2p²3s, 2s2p³-2s2p²3d, 2s²2p²-2s2p²3p, and 2s²2p²-2s²2p4d transitions are taken from the Opacity Project(OP) [2]. Multiplet average results from OP have been decomposed into fine-structure components assuming LS-coupling, as indicated by the notation LS in the reference column.

    References

  1. K.M. Aggarwal, Astrophys. J. Suppl. Ser. 118, 589 (1998).
      
  2. NASA TIPTOPbase (Downloaded 23 August 1995).
     

   

   
• S XII   (Sulfur   Z = 16)

  B I isoelectronic sequence

  Ground state   1s²2s²2p ²P°_1/2

  Ionization energy   4 552 500 cm^-1 (564.44 eV)

  Data are tabulated for 156 transitions in the range 23 Å to 171 Å. Transition probabilities for the 2s²2p-2s²nd(n=3-7), 2s2p²-2s2p²nd(n=3-4), and 2s2p²-2s2p3p transitions are from calculations with the Cowan relativistic Hartree-Fock code (HFR) by Fawcett and Hayes [1]. Remaining results are taken from the Opacity Project (OP) [2]. The multiplet values from OP have been decomposed into fine-structure components assuming LS-coupling, as indicated by the notation LS in the reference column.

    References

  1. B.C. Fawcett, R.W. Hayes, Phys. Scr. 36, 80 (1987).
      
  2. NASA TIPTOPbase (Downloaded 23 August 1995).
     

   

   
• S XIII   (Sulfur   Z = 16)

  Be I isoelectronic sequence

  Ground state   1s²2s^{2 1}S₀

  Ionization energy   5 260 000 cm^-1 (652.2 eV)

  Data are tabulated for 103 transitions in the range 23 Å to 167 Å. Transition probabilities for the 2s2p-2s3s, 2s2p-2s3d, 2s2p-2p3p, and 2p2-2p3d transition arrays are taken from many-body perturbation theory (MBPT) calculations [1]. Transition probabilities for the 2p²-2s3p transitions are mean values of MBPT [1] and results obtained bu Eissner and Tully with the atomic structure code SUPERSTRUCTURE [2]. Remaining results are taken from Opacity Project have been decomposed into fine-structure components assuming LS-coupling, as indicated by the notation LS in the reference column. For the intercombination line 2s^{2 1}S₀-2s3p ³P°₁(32.191 Å) we give the mean of results from MBPT [1], SUPERSTRUCTURE [2], and a 1/Z expansion method [4].

    References

  1. U.I. Safronova, A. Derevianko, M.S. Safronova, and W.R. Johnson, J. Phys. B: At. Mol. Phys. 32, 3527 (1999). (Complete data listing from private communication 9 March 2000.)
      
  2. W.E. Eissner and J.A. Tully, Astron. Astrophys. 253, 625 (1992).
      
  3. NASA TIPTOPbase (Downloaded 23 August 1995).
      
  4. Yu. I. Ralchenko and L.A. Vainshtein, Phys. Rev. A 52, 2449 (1995).

   

   
• S XIV   (Sulfur   Z = 16)

  Li I isoelectronic sequence

  Ground state   1s²2s ²S_1/2

  Ionization energy   5 702 400 cm^-1 (707.01 eV)

  Data are tabulated for 32 transitions in the range 21 Å to 97 Å. Transition probabilities for the 2s-np(n=3-5), 2p-ns(n=3-5), and 2p-nd(n=3-5) arrays are mean values of results obtained by Guennou and Sureau with a direct self-consistent field method (SCF) [1] and results of Zhang et al. [2] obtained with relativistic atomic structure and distorted wave collision strength programs. Level values with square brackets are from precise calculations as derived in the introduction.

    References

  1. H. Guennou and A. Sureau, J. Phys. B 20, 919 (1987).
      
  2. H.L. Zhang, D.H. Sampson, and C.J. Fontes, At. Data Nucl. Data Tables 44, 31 (1990).