Abstract

The 3<i>p</i><sup>6</sup> 3<i>d</i><sup>8</sup>–3<i>p</i><sup>5</sup> 3<i>d</i><sup>9</sup> transitions in Sr XIII, Y XIV, Zr XVI, Nb XVI, and Mo XVII have been newly measured by means of a low-inductance vacuum spark and a 10.7-m grazing-incidence spectrograph. The measurements have led to an improved analysis of this complex transition group in these ions. All levels of the combining configurations have been established. The energy parameters determined from least-squares fits to the observed levels are compared with Hartree-Fock calculations. The effective interaction α<i>L</i>(<i>L</i> + 1) for the 3<i>p</i><sup>6</sup> 3<i>d</i><sup>8</sup> configuration decreases markedly with increasing ionization. The effective electrostatic interactions <i>D</i><sup>1</sup>(3<i>p</i>3<i>d</i>) and <i>X</i><sup>2</sup>(3<i>p</i>3<i>d</i>) for the 3<i>p</i><sup>5</sup> 3<i>d</i><sup>9</sup> configuration are practically constant through the sequence.

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  1. M. W. D. Mansfield et al., "The XUV spectra of highly ionized molybdenum," J. Phys. B 11, 1521–1544 (1978).
  2. M. I. Bogdanovichene et al., "3d8–3p5 3d9 transitions in spectra of Y XIV-Mo XVII," Opt. Spektrosk. 49, 447–452 (1980).
  3. 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).
  4. J. Reader and N. Acquista, "4s–4p resonance transitions in highly charged Cu- and Zn-like ions," Phys. Rev. Lett. 39, 184–187 (1977).
  5. 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).
  6. J. Reader and N. Acquista, "Spectrum and energy levels of tentimes ionized yttrium (Y XI)," J. Opt. Soc. Am. 69, 1285–1288 (1979).
  7. J. Reader and N. Acquista, "Spectrum and energy levels of eleven-times ionized zirconium (Zr XII)," J. Opt. Soc. Am. 69, 1659–1662 (1979).
  8. J. Reader and N. Acquista, "Spectrum and energy levels of twelve-times ionized niobium (Nb XIII)," J. Opt. Soc. Am. 70, 317–321 (1980).
  9. C. Froese, "Numerical solution of the Hartree-Fock equations," Can. J. Phys. 41, 1895–1910 (1963); C. Froese-Fischer and M. Wilson, "Programs for atomic structure calculations," Argonne National Laboratory Report No. 7404 (National Technical Information Service, Springfield, Va., 1968).
  10. Optimization of the level values was done with the computer program ELCALCpr ogrammed by L. J. Radziemski, Jr.
  11. L. I. Podobedova, A. A. Ramonas, and A. N. Ryabtsev, "Analysis of the spectrum of Ge VII," Opt. Spektrosk. 49, 453–459 (1980).
  12. E. Meinders, "Revised analysis of the Cu Iv spectrum," Physica (Utrecht) 84C, 117–132 (1976).
  13. This notation for the effective electrostatic interactions is that given by J. Sugar and V. Kaufman, "Fourth spectrum of lutetium," J. Opt. Soc. Am.62, 562–570 (1972). In our energy matrix the coefficients of D1 (3p3d) are [5]½/10 for1,3P, [5]½/30 for 1,3D, and -[5]½/15 for 1,3F; the coefficients of X2(3p3d) are 1/10 for 1P, - 1/10 for 3P, -1/6 for 1D, 1/6 for 3D, -1/15 for 1F; and 1/15 for 3F.

1980 (4)

M. I. Bogdanovichene et al., "3d8–3p5 3d9 transitions in spectra of Y XIV-Mo XVII," Opt. Spektrosk. 49, 447–452 (1980).

L. I. Podobedova, A. A. Ramonas, and A. N. Ryabtsev, "Analysis of the spectrum of Ge VII," Opt. Spektrosk. 49, 453–459 (1980).

J. Reader and N. Acquista, "Spectrum and energy levels of twelve-times ionized niobium (Nb XIII)," J. Opt. Soc. Am. 70, 317–321 (1980).

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).

1979 (3)

1978 (1)

M. W. D. Mansfield et al., "The XUV spectra of highly ionized molybdenum," J. Phys. B 11, 1521–1544 (1978).

1977 (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).

1976 (1)

E. Meinders, "Revised analysis of the Cu Iv spectrum," Physica (Utrecht) 84C, 117–132 (1976).

Acquista, N.

Bogdanovichene, M. I.

M. I. Bogdanovichene et al., "3d8–3p5 3d9 transitions in spectra of Y XIV-Mo XVII," Opt. Spektrosk. 49, 447–452 (1980).

Burkhalter, P. G.

Cowan, R. D.

Froese, C.

C. Froese, "Numerical solution of the Hartree-Fock equations," Can. J. Phys. 41, 1895–1910 (1963); C. Froese-Fischer and M. Wilson, "Programs for atomic structure calculations," Argonne National Laboratory Report No. 7404 (National Technical Information Service, Springfield, Va., 1968).

Kaufman, V.

This notation for the effective electrostatic interactions is that given by J. Sugar and V. Kaufman, "Fourth spectrum of lutetium," J. Opt. Soc. Am.62, 562–570 (1972). In our energy matrix the coefficients of D1 (3p3d) are [5]½/10 for1,3P, [5]½/30 for 1,3D, and -[5]½/15 for 1,3F; the coefficients of X2(3p3d) are 1/10 for 1P, - 1/10 for 3P, -1/6 for 1D, 1/6 for 3D, -1/15 for 1F; and 1/15 for 3F.

Luther, G.

Mansfield, M. W. D.

M. W. D. Mansfield et al., "The XUV spectra of highly ionized molybdenum," J. Phys. B 11, 1521–1544 (1978).

Meinders, E.

E. Meinders, "Revised analysis of the Cu Iv spectrum," Physica (Utrecht) 84C, 117–132 (1976).

Podobedova, L. I.

L. I. Podobedova, A. A. Ramonas, and A. N. Ryabtsev, "Analysis of the spectrum of Ge VII," Opt. Spektrosk. 49, 453–459 (1980).

Ramonas, A. A.

L. I. Podobedova, A. A. Ramonas, and A. N. Ryabtsev, "Analysis of the spectrum of Ge VII," Opt. Spektrosk. 49, 453–459 (1980).

Reader, J.

Ryabtsev, A. N.

L. I. Podobedova, A. A. Ramonas, and A. N. Ryabtsev, "Analysis of the spectrum of Ge VII," Opt. Spektrosk. 49, 453–459 (1980).

Sugar, J.

This notation for the effective electrostatic interactions is that given by J. Sugar and V. Kaufman, "Fourth spectrum of lutetium," J. Opt. Soc. Am.62, 562–570 (1972). In our energy matrix the coefficients of D1 (3p3d) are [5]½/10 for1,3P, [5]½/30 for 1,3D, and -[5]½/15 for 1,3F; the coefficients of X2(3p3d) are 1/10 for 1P, - 1/10 for 3P, -1/6 for 1D, 1/6 for 3D, -1/15 for 1F; and 1/15 for 3F.

J. Opt. Soc. Am. (5)

J. Phys. B (1)

M. W. D. Mansfield et al., "The XUV spectra of highly ionized molybdenum," J. Phys. B 11, 1521–1544 (1978).

Opt. Spektrosk. (2)

M. I. Bogdanovichene et al., "3d8–3p5 3d9 transitions in spectra of Y XIV-Mo XVII," Opt. Spektrosk. 49, 447–452 (1980).

L. I. Podobedova, A. A. Ramonas, and A. N. Ryabtsev, "Analysis of the spectrum of Ge VII," Opt. Spektrosk. 49, 453–459 (1980).

Phys. Rev. Lett. (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).

Physica (1)

E. Meinders, "Revised analysis of the Cu Iv spectrum," Physica (Utrecht) 84C, 117–132 (1976).

Other (3)

This notation for the effective electrostatic interactions is that given by J. Sugar and V. Kaufman, "Fourth spectrum of lutetium," J. Opt. Soc. Am.62, 562–570 (1972). In our energy matrix the coefficients of D1 (3p3d) are [5]½/10 for1,3P, [5]½/30 for 1,3D, and -[5]½/15 for 1,3F; the coefficients of X2(3p3d) are 1/10 for 1P, - 1/10 for 3P, -1/6 for 1D, 1/6 for 3D, -1/15 for 1F; and 1/15 for 3F.

C. Froese, "Numerical solution of the Hartree-Fock equations," Can. J. Phys. 41, 1895–1910 (1963); C. Froese-Fischer and M. Wilson, "Programs for atomic structure calculations," Argonne National Laboratory Report No. 7404 (National Technical Information Service, Springfield, Va., 1968).

Optimization of the level values was done with the computer program ELCALCpr ogrammed by L. J. Radziemski, Jr.

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