Abstract

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 3d<sup>10</sup>nl 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 <sup>2</sup>F term is inverted. Also identified were 12 transitions of the type 3d<sup>10</sup>4s–3d<sup>9</sup>4s4p and 3d<sup>10</sup>4p–3d<sup>9</sup>4p<sup>2</sup>, permitting the determination of several 3d<sup>9</sup>4s4p and 3d<sup>9</sup>4p<sup>2</sup> levels. The observed 3d<sup>10</sup>nl energy levels and parameters are compared with Hartree–Fock calculations. The ionization energy is determined from the 3d<sup>10</sup>ns and nƒ series to be 1 430 000 ± 500 cm<sup>-1</sup> (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.

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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).
  8. W. Persson and S. Valind, "The spectrum of doubly ionized strontium (Sr III)," Phys. Scr. 5, 187–200 (1972).
  9. J. E. Hansen and W. Persson, "Spectrum of trebly-ionized strontium (Sr IV)," Phys. Scr. 13, 166–180 (1976).
  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).
  15. L. J. Curtis and D. G. Ellis, "A formula for cancellation disappearances of atomic oscillator strengths," J. Phys. B 11, L543–546 (1978).
  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).

1981

1980

1979

1978

L. J. Curtis and D. G. Ellis, "A formula for cancellation disappearances of atomic oscillator strengths," J. Phys. B 11, L543–546 (1978).

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).

1977

J. Reader and N. Acquista, "4s–4p resonance transitions in highly charged Cu- and Zn-like ions," Phys. Rev. Lett. 39, 184–187 (1977).

1976

J. E. Hansen and W. Persson, "Spectrum of trebly-ionized strontium (Sr IV)," Phys. Scr. 13, 166–180 (1976).

1972

W. Persson and S. Valind, "The spectrum of doubly ionized strontium (Sr III)," Phys. Scr. 5, 187–200 (1972).

1969

L. Å. Svensson and J. O. Ekberg, "The titanium vacuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–163 (1969).

1967

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

1947

B. Edlén, "Spectra of highly ionized atoms," Physica 13, 545–554 (1947).

Acquista, N.

Burkhalter, P. G.

Cheng, K. T.

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).

Cohen, L.

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

Cowan, R. D.

Curtis, L. J.

L. J. Curtis, "Cancellations in atomic dipole transition moments in the Cu isoelectronic sequence," J. Opt. Soc. Am. 71, 566–568 (1981).

L. J. Curtis and D. G. Ellis, "A formula for cancellation disappearances of atomic oscillator strengths," J. Phys. B 11, L543–546 (1978).

Edlén, B.

B. Edlén, "Spectra of highly ionized atoms," Physica 13, 545–554 (1947).

Ekberg, J. O.

L. Å. Svensson and J. O. Ekberg, "The titanium vacuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–163 (1969).

Ellis, D. G.

L. J. Curtis and D. G. Ellis, "A formula for cancellation disappearances of atomic oscillator strengths," J. Phys. B 11, L543–546 (1978).

Feldman, U.

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

Froese, C.

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).

Hansen, J. E.

J. E. Hansen and W. Persson, "Spectrum of trebly-ionized strontium (Sr IV)," Phys. Scr. 13, 166–180 (1976).

Kim, Y. -K.

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).

Livingston, A. E.

A. E. Livingston et al., "Energies and lifetimes of excited states in copperlike Kr VIII," Phys. Rev. A 21, 771–781 (1980).

Luther, G.

Moore, C. E.

C. E. Moore, Atomic Energy Levels, Vol. II, National Bureau of Standards circ. no. 467 (U.S. Government Printing Office, Washington, D.C., 1952).

Persson, W.

J. E. Hansen and W. Persson, "Spectrum of trebly-ionized strontium (Sr IV)," Phys. Scr. 13, 166–180 (1976).

W. Persson and S. Valind, "The spectrum of doubly ionized strontium (Sr III)," Phys. Scr. 5, 187–200 (1972).

W. Persson, Lund Institute of Technology, Lund, Sweden, personal communication.

Radziemski, Jr., L.

Optimization of the level values was done with the computer program ELCALC, which was developed by L. Radziemski, Jr.

Reader, J.

Ryabtsev, A.

Ryabtsev, A. N.

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).

Svensson, L. Å.

L. Å. Svensson and J. O. Ekberg, "The titanium vacuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–163 (1969).

Swartz, M.

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

Valind, S.

W. Persson and S. Valind, "The spectrum of doubly ionized strontium (Sr III)," Phys. Scr. 5, 187–200 (1972).

Wyart, J. -F.

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).

Ark. Fys.

L. Å. Svensson and J. O. Ekberg, "The titanium vacuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–163 (1969).

At. Data Nucl. Data Tables

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).

J. Opt. Soc. Am.

J. Phys. B

L. J. Curtis and D. G. Ellis, "A formula for cancellation disappearances of atomic oscillator strengths," J. Phys. B 11, L543–546 (1978).

Phys. Rev. A

A. E. Livingston et al., "Energies and lifetimes of excited states in copperlike Kr VIII," Phys. Rev. A 21, 771–781 (1980).

Phys. Rev. Lett.

J. Reader and N. Acquista, "4s–4p resonance transitions in highly charged Cu- and Zn-like ions," Phys. Rev. Lett. 39, 184–187 (1977).

Phys. Scr.

W. Persson and S. Valind, "The spectrum of doubly ionized strontium (Sr III)," Phys. Scr. 5, 187–200 (1972).

J. E. Hansen and W. Persson, "Spectrum of trebly-ionized strontium (Sr IV)," Phys. Scr. 13, 166–180 (1976).

Physica

B. Edlén, "Spectra of highly ionized atoms," Physica 13, 545–554 (1947).

Rev. Sci. Instrum.

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

Other

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).

W. Persson, Lund Institute of Technology, Lund, Sweden, personal communication.

Optimization of the level values was done with the computer program ELCALC, which was developed by L. Radziemski, Jr.

C. E. Moore, Atomic Energy Levels, Vol. II, National Bureau of Standards circ. no. 467 (U.S. Government Printing Office, Washington, D.C., 1952).

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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