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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 71, Iss. 5 — May. 1, 1981
  • pp: 569–573

Spectrum and energy levels of nine-times ionized strontium (Sr x)

Nicolo Acquista and Joseph Reader  »View Author Affiliations

JOSA, Vol. 71, Issue 5, pp. 569-573 (1981)

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The spectrum of the copperlike ion Sr x was observed with a low-inductance spark in the region 70–630 Å on the 10.7-m grazing-incidence spectrograph at the National Bureau of Standards. From the identification of 30 lines, a system of 23 energy levels of the type 3d10nl was determined. The level system includes the configurations ns (n = 4–7), np (n = 4–6), nd (n = 4–6), nƒ (n = –6), and ng (n = 5). The 4ƒ 2F term is inverted. Also identified were 12 transitions of the type 3d104s–3d94s4p and 3d104p–3d94p2, permitting the determination of several 3d94s4p and 3d94p2 levels. The observed 3d10nl energy levels and parameters are compared with Hartree–Fock calculations. The ionization energy is determined from the 3d10ns and nƒ series to be 1 430 000 ± 500 cm-1 (177.30 ± 0.06 eV). Data for 3d—4p transitions in Sr IX and Sr XI and 3p–3d transitions in Sr XII are also presented.

Nicolo Acquista and Joseph Reader, "Spectrum and energy levels of nine-times ionized strontium (Sr x)," J. Opt. Soc. Am. 71, 569-573 (1981)

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  1. J. Reader and N. Acquista, "4s–4p resonance transitions in highly charged Cu- and Zn-like ions," Phys. Rev. Lett. 39, 184–187 (1977).
  2. U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).
  3. J. Reader and N. Acquista, "Spectrum and energy levels of tentimes ionized yttrium (Y XI)," J. Opt. Soc. Am. 69, 1285–1288 (1979).
  4. J. Reader and N. Acquista, "Spectrum and energy levels of eleven-times ionized zirconium (Zr XII)," J. Opt. Soc. Am. 69, 1659–1662 (1979).
  5. J. Reader and N. Acquista, "Spectrum and energy levels of twelve-times ionized niobium (Nb XIII),'" J. Opt. Soc. Am. 70, 317–321 (1980).
  6. J. Reader, G. Luther, and N. Acquista, "Spectrum and energy levels of thirteen-times ionized molybdenum (Mo XIV)," J. Opt. Soc. Am. 69, 144–149 (1979); "Revised 6p 2P½ level of Mo XIV," 71, 204 (1981).
  7. L. Å. Svensson and J. O. Ekberg, "The titanium vacuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–163 (1969).
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  10. W. Persson, Lund Institute of Technology, Lund, Sweden, personal communication.
  11. Optimization of the level values was done with the computer program ELCALC, which was developed by L. Radziemski, Jr.
  12. K. T. Cheng and Y. -K. Kim, "Energy levels, wavelengths, and transition probabilities for Cu-like ions," At. Data Nucl. Data Tables 22, 547–563 (1978).
  13. A. E. Livingston et al., "Energies and lifetimes of excited states in copperlike Kr VIII," Phys. Rev. A 21, 771–781 (1980).
  14. C. Froese, "Numerical solution of the Hartree–Fock equations," Can. J. Phys. 41, 1895–1910 (1963); C. Froese-Fischer and M. Wilson, "Program for atomic structure calculations," Argonne National Laboratory rep. no. 7404 (National Technical Information Service, Springfield, Va., 1968).
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  16. L. J. Curtis, "Cancellations in atomic dipole transition moments in the Cu isoelectronic sequence," J. Opt. Soc. Am. 71, 566–568 (1981).
  17. J. Reader and A. Ryabtsev, "3p63d8–3p53d9 transitions in Sr XIII, Y XIV, Zr xv, Nb XVI, and Mo XVII," J. Opt. Soc. Am. 71, 231–237 (1981).
  18. P. G. Burkhalter, J. Reader, and R. D. Cowan "Spectra of Mo XIII-XVIII from a laser-produced plasma and a low-inductance vacuum spark," J. Opt. Soc. Am. 70, 912–919 (1980).
  19. J. -F. Wyart, J. Reader, and A. N. Ryabtsev, "3d–4p transitions in the copper-like ions Y XI, Zr XII, Nb XIII, and Mo XIV," J. Opt. Soc. Am. 71 (to be published, June 1981).
  20. B. Edlén, "Spectra of highly ionized atoms," Physica 13, 545–554 (1947).
  21. C. E. Moore, Atomic Energy Levels, Vol. II, National Bureau of Standards circ. no. 467 (U.S. Government Printing Office, Washington, D.C., 1952).

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