Magnesium   -   Spectral Data for the Chandra X-ray Observatory

• Mg V   (Magnesium Z = 12)

  O I isoelectronic sequence

  Ground state   1s²2s²2p^{4 3}P₂

  Ionization energy 1 139 420 cm^-1 (141.27 eV)

  Data are tabulated for 188 transitions in the range 92 Å to 165 Å. Transition probabilities for the 2s²2p⁴-2s²2p³3s, and 2s²2p⁴-2s²2p³3d arrays are taken from the multiconfiguration Hartree-Fock (MCHF) calculations of Tachiev and Froese Fischer [1]. Values for the other arrays 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 28 March, 2002).
      
  2. NASA TIPTOPbase (Downloaded 28 July 1995).
     

   

   
• Mg VI   (Magnesium Z = 12)

  N I isoelectronic sequence

  Ground state   1s²2s²2p^{3 4}S°_3/2

  Ionization energy 1 506 300 cm^-1 (186.76 eV)

  Data are tabulated for 276 transitions in the range 74 Å to 172 Å. Transition probabilities for the 2s²2p³-2s²2p²3s, 2s²2p³-2s²2p²3d, and 2s2p⁴-2s2p³(⁵S°)3s arrays are taken from the multiconfiguration Hartree-Fock (MCHF) calculations of Tachiev and Froese Fischer [1]. Values for the other arrays 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 28 March, 2002).
      
  2. NASA TIPTOPbase (Downloaded 28 July, 1995).
     

   

   
• Mg VII   (Magnesium Z = 12)

  C I isoelectronic sequence

  Ground state   1s²2s²2p^{2 3}P₀

  Ionization energy 1 814 900 cm^-1 (225.02 eV)

  Data are tabulated for 170 transitions in the range 59 Å to 166 Å. For the transition arrays 2s²2p²-2s²2p3s, 2s²2p²-2s²2p3d, 2p⁴-2s²2p3d, and 2s2p³-2s²2p3p we give mean values of MCHF [1] and CIV3 [2] calculations. Transition probabilities for the 2s2p³-2s2p²3s, 2s2p³-2s2p²3d, and 2s²2p²-2s2p²3p arrays are taken from the calculations carried out by Fawcett with Cowan’s relativistic Hartree Fock code (HFR) [3]. Remaining results are taken from the Opacity Project (OP) [4]. 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 28 March, 2002).
      
  2. K.M. Aggarwal, Astrophys. J., Suppl. Ser. 118, 589 (1998).
      
  3. B.C. Fawcett, At. Data Nucl. Data Tables 36, 80 (1987).
      
  4. NASA TIPTOPbase (Downloaded 28 July, 1995).
     

   

   
• Mg VIII   (Magnesium   Z = 12)

  B I isoelectronic sequence

  Ground state   1s²2s²2p ²P°_1/2

  Ionization energy 2 145 100 cm^-1 (265.96 eV)

  Data are tabulated for 318 transitions in the range 51 Å to 172 Å. Transition probabilities for the 2s²2p-2s²3s, 2s²2p-2s²3d, 2s2p²-2s2p3s, 2p³-2s²3s, and 2p³-2s²3d arrays are taken from the multiconfiguration Hartree-Fock (MCHF) calculations of Tachiev and Froese Fischer [1]. Values for the other arrays 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 28 March, 2002).
      
  2. NASA TIPTOPbase (Downloaded 28 July, 1995).

   

   
• Mg IX   (Magnesium   Z = 12)

  Be I isoelectronic sequence

  Ground state   1s²2s^{2 1}S₀

  Ionization energy 2 646 000 cm^-1 (328.06 eV)

  Data are tabulated for 216 transitions in the range of 40 Å to 171 Å. Transition probabilities for the 2s2p-2s3s, 2s2p-2s3d, and 2p²-2s3p arrays are taken from MCHF calculations [1]. Values for the 2s2p-2p3p, 2p²-2p3s, and 2p²-2p3d arrays are taken from the many-body perturbation theory (MBPT) calculations of Safronova et al [2]. Remaining values are then from the Opacity Project (OP) [3]. 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.

  For the transition probability of the 2s^{2 1}S-2s3p ³P ₁ intercombination line (62.60 Å) the mean value between the MCHF result [1] and the experimental result of Granzow, Heckmann and Träbert [4] is given. In this work beam foil spectroscopy was used to investigate the decay of the 2s3p ³P°_0,1,2 levels. The mean wavelength of the transition 2p^2 3P-2s3p ³P° and the lifetimes of the 2s3p ³P°_0,1,2 levels were measured. The mean energy of the 2s3p ³P° term was established as 1 597 500 cm^-1 from the measured wavelength (81.35 Å) of the 2p^2 3P-2s3p ³P° transition and the mean energy of the 2p^2 3P term (368 220 cm^-1). The 2s3p ³P° term is not present in the NIST Atomic Spectra Database because the previous compilation was made before 1994. Ten transitions involving levels of the 2s3p ³P° term are included in the present table.

    References

  1. G. Tachiev and C. Froese Fischer, The MCHF/MCDHF Collection (Downloaded 28 March, 2002).
      
  2. 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.)
      
  3. NASA TIPTOPbase (Downloaded 28 July, 1995).
      
  4. J. Granzow, P.H. Heckmann, and E. Träbert, Phys. Scr. 49, 148 (1994).

   

   
• Mg X   (Magnesium Z = 12)

  Li I isoelectronic sequence

  Ground state   1s²2s ²S_1/2

  Ionization energy 2 964 060 cm^-1 (367.50 eV)

  Data are tabulated for 73 transitions in the range 35 Å to 171 Å. Transition probabilities for the 2s-np(n=3-5) and 2p-ns(n=3-5), and 2p-nd(n=3-5) transitions are taken from calculations by Zhang et al. [1] with relativistic atomic structure and distorted wave collision strength programs. 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. H.L. Zhang, D.H. Sampson, C.J. Fontes, At. Data Nucl. Data Tables 44, 31 (1990).
      
  2. NASA TIPTOPbase (Downloaded 28 July, 1995).