Abstract

The spectrum of Mg4+ was observed between 95 and 400 Å. New wavelengths result in revised-energy level values and some resolved term structure. Parametric calculations with configuration interaction were made for the 2s2p5, 2s22p33s, and 2s22p33d configurations. These support rejection of some levels and some new identifications.

© 1980 Optical Society of America

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References

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  1. J. Söderqvist, “Vakuumfunkenspektren der elemente natrium, magnesium, aluminium, und silicium,” Nova Acta Reg. Soc. Sci. Ups. IV 9, 4–103 (1934);and “Spektren von hochionisiertem natrium und magnesium,” Ark. Mat. Astron. Fys. 32A, 1–33 (1946).
  2. G. A. Johannesson, T. Lundström, and L. Minnhagen, “Extended Analysis of the Spectrum of Mg iv,” Phys. Scr. 6, 129–137 (1972).
    [Crossref]
  3. B. C. Fawcett, M. Galanti, and N. J. Peacock, “Spectral Classifications in the Fe xixto Fe xxiii isoelectronic sequences,” J. Phys.B 7, 1149–1153 (1974).
    [Crossref]
  4. H. Guennou, A. Sureau, A. Carillon, and G. Jamelot, “New spectroscopic results in the 2s2p5–2s2p43s transition array of Mg4+, Al5+, and Si6+ ions,” J. Phys. B 12, 1657–1664 (1979).
    [Crossref]
  5. M.-C. Artru and V. Kaufman, “Analysis of the spectrum of triply ionized magnesium (Mgiv),” J. Opt. Soc. Am. 62, 949–957 (1972).
    [Crossref]
  6. R. L. Kelly and L. J. Palumbo, “Atomic and ionic emission lines below 2000 Å, Hydrogen through Krypton,” NRL Report 7599, 1973 (unpublished).
  7. L. Cohen, U. Feldman, M. Swartz, and J. H. Underwood, “Study of the x rays produced by a vacuum spark,” J. Opt. Soc. Am. 58, 843–846 (1968).
    [Crossref]
  8. L. Å. Svensson and J. O. Ekberg, “The titanium vacuum spark spectrum from 50 to 425 Å,” Ark. Fys. 40, 145–163 (1969).
  9. Y. Bordarier and A. Carlier, computer programs written at the Laboratoire Aimé Cotton, Orsay, France (unpublished).
  10. C. Froese, “Numerical Solution of the Hartree–Fock Equations,” Can. J. Phys. 41, 1895–1910 (1963).
    [Crossref]
  11. Z. B. Goldschmidt and J. Starkand, “Two- and three-electron electrostatic effective interactions in lnl′ configurations,” J. Phys. B 3, 141(L) (1970).
    [Crossref]

1979 (1)

H. Guennou, A. Sureau, A. Carillon, and G. Jamelot, “New spectroscopic results in the 2s2p5–2s2p43s transition array of Mg4+, Al5+, and Si6+ ions,” J. Phys. B 12, 1657–1664 (1979).
[Crossref]

1974 (1)

B. C. Fawcett, M. Galanti, and N. J. Peacock, “Spectral Classifications in the Fe xixto Fe xxiii isoelectronic sequences,” J. Phys.B 7, 1149–1153 (1974).
[Crossref]

1972 (2)

M.-C. Artru and V. Kaufman, “Analysis of the spectrum of triply ionized magnesium (Mgiv),” J. Opt. Soc. Am. 62, 949–957 (1972).
[Crossref]

G. A. Johannesson, T. Lundström, and L. Minnhagen, “Extended Analysis of the Spectrum of Mg iv,” Phys. Scr. 6, 129–137 (1972).
[Crossref]

1970 (1)

Z. B. Goldschmidt and J. Starkand, “Two- and three-electron electrostatic effective interactions in lnl′ configurations,” J. Phys. B 3, 141(L) (1970).
[Crossref]

1969 (1)

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

1968 (1)

1963 (1)

C. Froese, “Numerical Solution of the Hartree–Fock Equations,” Can. J. Phys. 41, 1895–1910 (1963).
[Crossref]

1934 (1)

J. Söderqvist, “Vakuumfunkenspektren der elemente natrium, magnesium, aluminium, und silicium,” Nova Acta Reg. Soc. Sci. Ups. IV 9, 4–103 (1934);and “Spektren von hochionisiertem natrium und magnesium,” Ark. Mat. Astron. Fys. 32A, 1–33 (1946).

Artru, M.-C.

Bordarier, Y.

Y. Bordarier and A. Carlier, computer programs written at the Laboratoire Aimé Cotton, Orsay, France (unpublished).

Carillon, A.

H. Guennou, A. Sureau, A. Carillon, and G. Jamelot, “New spectroscopic results in the 2s2p5–2s2p43s transition array of Mg4+, Al5+, and Si6+ ions,” J. Phys. B 12, 1657–1664 (1979).
[Crossref]

Carlier, A.

Y. Bordarier and A. Carlier, computer programs written at the Laboratoire Aimé Cotton, Orsay, France (unpublished).

Cohen, L.

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).

Fawcett, B. C.

B. C. Fawcett, M. Galanti, and N. J. Peacock, “Spectral Classifications in the Fe xixto Fe xxiii isoelectronic sequences,” J. Phys.B 7, 1149–1153 (1974).
[Crossref]

Feldman, U.

Froese, C.

C. Froese, “Numerical Solution of the Hartree–Fock Equations,” Can. J. Phys. 41, 1895–1910 (1963).
[Crossref]

Galanti, M.

B. C. Fawcett, M. Galanti, and N. J. Peacock, “Spectral Classifications in the Fe xixto Fe xxiii isoelectronic sequences,” J. Phys.B 7, 1149–1153 (1974).
[Crossref]

Goldschmidt, Z. B.

Z. B. Goldschmidt and J. Starkand, “Two- and three-electron electrostatic effective interactions in lnl′ configurations,” J. Phys. B 3, 141(L) (1970).
[Crossref]

Guennou, H.

H. Guennou, A. Sureau, A. Carillon, and G. Jamelot, “New spectroscopic results in the 2s2p5–2s2p43s transition array of Mg4+, Al5+, and Si6+ ions,” J. Phys. B 12, 1657–1664 (1979).
[Crossref]

Jamelot, G.

H. Guennou, A. Sureau, A. Carillon, and G. Jamelot, “New spectroscopic results in the 2s2p5–2s2p43s transition array of Mg4+, Al5+, and Si6+ ions,” J. Phys. B 12, 1657–1664 (1979).
[Crossref]

Johannesson, G. A.

G. A. Johannesson, T. Lundström, and L. Minnhagen, “Extended Analysis of the Spectrum of Mg iv,” Phys. Scr. 6, 129–137 (1972).
[Crossref]

Kaufman, V.

Kelly, R. L.

R. L. Kelly and L. J. Palumbo, “Atomic and ionic emission lines below 2000 Å, Hydrogen through Krypton,” NRL Report 7599, 1973 (unpublished).

Lundström, T.

G. A. Johannesson, T. Lundström, and L. Minnhagen, “Extended Analysis of the Spectrum of Mg iv,” Phys. Scr. 6, 129–137 (1972).
[Crossref]

Minnhagen, L.

G. A. Johannesson, T. Lundström, and L. Minnhagen, “Extended Analysis of the Spectrum of Mg iv,” Phys. Scr. 6, 129–137 (1972).
[Crossref]

Palumbo, L. J.

R. L. Kelly and L. J. Palumbo, “Atomic and ionic emission lines below 2000 Å, Hydrogen through Krypton,” NRL Report 7599, 1973 (unpublished).

Peacock, N. J.

B. C. Fawcett, M. Galanti, and N. J. Peacock, “Spectral Classifications in the Fe xixto Fe xxiii isoelectronic sequences,” J. Phys.B 7, 1149–1153 (1974).
[Crossref]

Söderqvist, J.

J. Söderqvist, “Vakuumfunkenspektren der elemente natrium, magnesium, aluminium, und silicium,” Nova Acta Reg. Soc. Sci. Ups. IV 9, 4–103 (1934);and “Spektren von hochionisiertem natrium und magnesium,” Ark. Mat. Astron. Fys. 32A, 1–33 (1946).

Starkand, J.

Z. B. Goldschmidt and J. Starkand, “Two- and three-electron electrostatic effective interactions in lnl′ configurations,” J. Phys. B 3, 141(L) (1970).
[Crossref]

Sureau, A.

H. Guennou, A. Sureau, A. Carillon, and G. Jamelot, “New spectroscopic results in the 2s2p5–2s2p43s transition array of Mg4+, Al5+, and Si6+ ions,” J. Phys. B 12, 1657–1664 (1979).
[Crossref]

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.

Underwood, J. H.

Ark. Fys. (1)

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

Can. J. Phys. (1)

C. Froese, “Numerical Solution of the Hartree–Fock Equations,” Can. J. Phys. 41, 1895–1910 (1963).
[Crossref]

J. Opt. Soc. Am. (2)

J. Phys. B (2)

H. Guennou, A. Sureau, A. Carillon, and G. Jamelot, “New spectroscopic results in the 2s2p5–2s2p43s transition array of Mg4+, Al5+, and Si6+ ions,” J. Phys. B 12, 1657–1664 (1979).
[Crossref]

Z. B. Goldschmidt and J. Starkand, “Two- and three-electron electrostatic effective interactions in lnl′ configurations,” J. Phys. B 3, 141(L) (1970).
[Crossref]

J. Phys.B (1)

B. C. Fawcett, M. Galanti, and N. J. Peacock, “Spectral Classifications in the Fe xixto Fe xxiii isoelectronic sequences,” J. Phys.B 7, 1149–1153 (1974).
[Crossref]

Nova Acta Reg. Soc. Sci. Ups. IV (1)

J. Söderqvist, “Vakuumfunkenspektren der elemente natrium, magnesium, aluminium, und silicium,” Nova Acta Reg. Soc. Sci. Ups. IV 9, 4–103 (1934);and “Spektren von hochionisiertem natrium und magnesium,” Ark. Mat. Astron. Fys. 32A, 1–33 (1946).

Phys. Scr. (1)

G. A. Johannesson, T. Lundström, and L. Minnhagen, “Extended Analysis of the Spectrum of Mg iv,” Phys. Scr. 6, 129–137 (1972).
[Crossref]

Other (2)

R. L. Kelly and L. J. Palumbo, “Atomic and ionic emission lines below 2000 Å, Hydrogen through Krypton,” NRL Report 7599, 1973 (unpublished).

Y. Bordarier and A. Carlier, computer programs written at the Laboratoire Aimé Cotton, Orsay, France (unpublished).

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Figures (1)

FIG. 1
FIG. 1

Effect of configuration interaction and effective interactions on the positions of the 1P1 and 3P1 levels of the 2s2p5, 2s22p33s, and 2s2 2p33d configurations in Mgv. The experimental positions of the levels are compared with the eigenvalues obtained in four different diagonalizations where each set of interaction parameters is successively introduced. The parameter values are those of Table III.

Tables (4)

Tables Icon

TABLE I Classified lines of Mg v (96–377 Å).

Tables Icon

TABLE II Energy levels of Mg4+.

Tables Icon

TABLE III Parameter values for the interacting 2s2p5, 2s22p33s, and 2s22p33d configurations of Mg4+ and comparison with HF values.

Tables Icon

TABLE IV Departures from LS coupling in the J = 1 and J = 2 levels of 2s22p3(2D)3d and 2s22p3(2P)3d. All other levels of 2s2p5, 2s22p33s, and 2s22p33d have LS purities greater than 96%. Energy units are cm−1.