Abstract

A study of Mg IV between 80 and 2100 Å has led to the classification of 243 lines. A total of 23 odd and 64 even levels have been identified as belonging to the 2<i>s</i><sup>2</sup><i>p</i><sup>5</sup>, 2<i>s</i>2<i>p</i><sup>6</sup> , 2<i>s</i>2<i>p</i><sup>5</sup>3<i>s</i>, 2<i>s</i><sup>2</sup>2<i>p</i><sup>4</sup>3<i>p</i>, 2<i>s</i><sup>2</sup>2<i>p</i><sup>4</sup><i>ns</i>, and 2<i>s</i><sup>2</sup>2<i>p</i><sup>4</sup><i>nd</i> (<i>n</i> = 3, 4, 5) configurations. Matrix diagonalizations and least-squares fits to the observed levels lead to well-defined radial integrals and verify the level assignments. On the basis of comparisons in the F I isoelectronic sequence, designation changes are suggested for some 2<i>p</i><sup>4</sup>(<sup>3</sup><i>P</i>)3<i>d</i> levels of Na III, Al V, Si VI, P VII, and S VIII. New levels are given for Na III and Al V, and some previously listed levels in Na III and S VIII are rejected as unreal. An ionization energy of 880 800 cm<sup>-1</sup> is given for Mg VI.

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  1. J. Söderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV]9, No. 7 (1934).
  2. C. E. Moore, Atomnic Energy Levels, Vol. I, Natl. Bur. Std. (U. S.) Circ. No. 467 (U. S. Government Printing Office, Washington, D. C., 1949).
  3. C. B. Ross, Ph.D. thesis, Purdue University, 1969 (University Microfilms Order No. 70.3967).
  4. V. Kaufman, L. J. Radziemski, Jr., and K. L. Andrew, J. Opt. Soc. Am. 56, 911 (1966).
  5. L. J. Radziemski, Jr., K. L. Andrew, V. Kaufman, and U. Litzén, J. Opt. Soc. Am. 57, 336 (1967).
  6. V. Kaufman and J. F. Ward, J. Opt. Soc. Am. 56, 1591 (1966).
  7. P. Risberg, Arkiv Fysik 9, 483 (1955).
  8. L. A. Svensson and J. O. Ekberg, Arkiv Fysik 40, 145 (1969).
  9. The computer-codes sequence used was written by Y. Bordarier, A. Carlier, and P. Dagoury at the Laboratoire Aimé Cotton, Orsay, 91 France.
  10. R. E. Trees, Phys. Rev. 83, 756 (1951).
  11. G. Racah, Phys. Rev. 85, 381 (1952).
  12. V. Kaufman and L. J. Radziemski, Jr., J. Opt. Soc. Am. 59, 227 (1969).
  13. Z. B. Goldschmidt and J. Starkand, J. Phys. B 3, 141(L) (1970).
  14. J. Sugar and V. Kaufman, J. Opt. Soc. Am. 62, 562 (1972).
  15. Z. B. Goldschmidt, Phys. Rev. A 3, 1872 (1971).
  16. C. Froese, Can. J. Phys. 41, 1895 (1963).
  17. W. Persson and L. Minnhagen, Arkiv Fysik 37, 273 (1968).
  18. B. Kjöllerström, N. G. Möller, and H. Svensson, Arkiv Fysik 29, 167 (1965).
  19. W. Persson, Physica Scripta 3, 133 (1971).
  20. D. H. Tomboulian, Phys. Rev. 54, 247 (1938).
  21. M. Gaillard, P. Ceyzériat, A. Denis, and M. Dufay, Compt. Rend. 269B, 526 (1969).
  22. K. Lidén, Arkiv Fysik 1, 229 (1949).
  23. J. Reader and J. Sugar, Phys. Rev. 137, B784 (1965).
  24. F. R. Rico, An. Real. Soc. espan. Fis. y Quim. A61, 113 (1960).
  25. B. Edlén, in Handbuch der Physik 27, edited by S. Flügge (Springer, Berlin, 1964), p. 198.

Andrew, K. L.

V. Kaufman, L. J. Radziemski, Jr., and K. L. Andrew, J. Opt. Soc. Am. 56, 911 (1966).

L. J. Radziemski, Jr., K. L. Andrew, V. Kaufman, and U. Litzén, J. Opt. Soc. Am. 57, 336 (1967).

Bordarier, Y.

The computer-codes sequence used was written by Y. Bordarier, A. Carlier, and P. Dagoury at the Laboratoire Aimé Cotton, Orsay, 91 France.

Carlier, A.

The computer-codes sequence used was written by Y. Bordarier, A. Carlier, and P. Dagoury at the Laboratoire Aimé Cotton, Orsay, 91 France.

Ceyzériat, P.

M. Gaillard, P. Ceyzériat, A. Denis, and M. Dufay, Compt. Rend. 269B, 526 (1969).

Dagoury, P.

The computer-codes sequence used was written by Y. Bordarier, A. Carlier, and P. Dagoury at the Laboratoire Aimé Cotton, Orsay, 91 France.

Denis, A.

M. Gaillard, P. Ceyzériat, A. Denis, and M. Dufay, Compt. Rend. 269B, 526 (1969).

Dufay, M.

M. Gaillard, P. Ceyzériat, A. Denis, and M. Dufay, Compt. Rend. 269B, 526 (1969).

Edlén, B.

B. Edlén, in Handbuch der Physik 27, edited by S. Flügge (Springer, Berlin, 1964), p. 198.

Ekberg, J. O.

L. A. Svensson and J. O. Ekberg, Arkiv Fysik 40, 145 (1969).

Froese, C.

C. Froese, Can. J. Phys. 41, 1895 (1963).

Gaillard, M.

M. Gaillard, P. Ceyzériat, A. Denis, and M. Dufay, Compt. Rend. 269B, 526 (1969).

Goldschmidt, Z. B.

Z. B. Goldschmidt and J. Starkand, J. Phys. B 3, 141(L) (1970).

Z. B. Goldschmidt, Phys. Rev. A 3, 1872 (1971).

Kaufman, V.

V. Kaufman and L. J. Radziemski, Jr., J. Opt. Soc. Am. 59, 227 (1969).

L. J. Radziemski, Jr., K. L. Andrew, V. Kaufman, and U. Litzén, J. Opt. Soc. Am. 57, 336 (1967).

J. Sugar and V. Kaufman, J. Opt. Soc. Am. 62, 562 (1972).

V. Kaufman, L. J. Radziemski, Jr., and K. L. Andrew, J. Opt. Soc. Am. 56, 911 (1966).

V. Kaufman and J. F. Ward, J. Opt. Soc. Am. 56, 1591 (1966).

Kjöllerström, B.

B. Kjöllerström, N. G. Möller, and H. Svensson, Arkiv Fysik 29, 167 (1965).

Lidén, K.

K. Lidén, Arkiv Fysik 1, 229 (1949).

Litzén, U.

L. J. Radziemski, Jr., K. L. Andrew, V. Kaufman, and U. Litzén, J. Opt. Soc. Am. 57, 336 (1967).

Minnhagen, L.

W. Persson and L. Minnhagen, Arkiv Fysik 37, 273 (1968).

Möller, N. G.

B. Kjöllerström, N. G. Möller, and H. Svensson, Arkiv Fysik 29, 167 (1965).

Moore, C. E.

C. E. Moore, Atomnic Energy Levels, Vol. I, Natl. Bur. Std. (U. S.) Circ. No. 467 (U. S. Government Printing Office, Washington, D. C., 1949).

Persson, W.

W. Persson and L. Minnhagen, Arkiv Fysik 37, 273 (1968).

W. Persson, Physica Scripta 3, 133 (1971).

Racah, G.

G. Racah, Phys. Rev. 85, 381 (1952).

Radziemski, Jr., L. J.

L. J. Radziemski, Jr., K. L. Andrew, V. Kaufman, and U. Litzén, J. Opt. Soc. Am. 57, 336 (1967).

V. Kaufman and L. J. Radziemski, Jr., J. Opt. Soc. Am. 59, 227 (1969).

V. Kaufman, L. J. Radziemski, Jr., and K. L. Andrew, J. Opt. Soc. Am. 56, 911 (1966).

Reader, J.

J. Reader and J. Sugar, Phys. Rev. 137, B784 (1965).

Rico, F. R.

F. R. Rico, An. Real. Soc. espan. Fis. y Quim. A61, 113 (1960).

Risberg, P.

P. Risberg, Arkiv Fysik 9, 483 (1955).

Ross, C. B.

C. B. Ross, Ph.D. thesis, Purdue University, 1969 (University Microfilms Order No. 70.3967).

Söderqvist, J.

J. Söderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV]9, No. 7 (1934).

Starkand, J.

Z. B. Goldschmidt and J. Starkand, J. Phys. B 3, 141(L) (1970).

Sugar, J.

J. Sugar and V. Kaufman, J. Opt. Soc. Am. 62, 562 (1972).

J. Reader and J. Sugar, Phys. Rev. 137, B784 (1965).

Svensson, H.

B. Kjöllerström, N. G. Möller, and H. Svensson, Arkiv Fysik 29, 167 (1965).

Svensson, L. A.

L. A. Svensson and J. O. Ekberg, Arkiv Fysik 40, 145 (1969).

Tomboulian, D. H.

D. H. Tomboulian, Phys. Rev. 54, 247 (1938).

Trees, R. E.

R. E. Trees, Phys. Rev. 83, 756 (1951).

Ward, J. F.

V. Kaufman and J. F. Ward, J. Opt. Soc. Am. 56, 1591 (1966).

Other (25)

J. Söderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV]9, No. 7 (1934).

C. E. Moore, Atomnic Energy Levels, Vol. I, Natl. Bur. Std. (U. S.) Circ. No. 467 (U. S. Government Printing Office, Washington, D. C., 1949).

C. B. Ross, Ph.D. thesis, Purdue University, 1969 (University Microfilms Order No. 70.3967).

V. Kaufman, L. J. Radziemski, Jr., and K. L. Andrew, J. Opt. Soc. Am. 56, 911 (1966).

L. J. Radziemski, Jr., K. L. Andrew, V. Kaufman, and U. Litzén, J. Opt. Soc. Am. 57, 336 (1967).

V. Kaufman and J. F. Ward, J. Opt. Soc. Am. 56, 1591 (1966).

P. Risberg, Arkiv Fysik 9, 483 (1955).

L. A. Svensson and J. O. Ekberg, Arkiv Fysik 40, 145 (1969).

The computer-codes sequence used was written by Y. Bordarier, A. Carlier, and P. Dagoury at the Laboratoire Aimé Cotton, Orsay, 91 France.

R. E. Trees, Phys. Rev. 83, 756 (1951).

G. Racah, Phys. Rev. 85, 381 (1952).

V. Kaufman and L. J. Radziemski, Jr., J. Opt. Soc. Am. 59, 227 (1969).

Z. B. Goldschmidt and J. Starkand, J. Phys. B 3, 141(L) (1970).

J. Sugar and V. Kaufman, J. Opt. Soc. Am. 62, 562 (1972).

Z. B. Goldschmidt, Phys. Rev. A 3, 1872 (1971).

C. Froese, Can. J. Phys. 41, 1895 (1963).

W. Persson and L. Minnhagen, Arkiv Fysik 37, 273 (1968).

B. Kjöllerström, N. G. Möller, and H. Svensson, Arkiv Fysik 29, 167 (1965).

W. Persson, Physica Scripta 3, 133 (1971).

D. H. Tomboulian, Phys. Rev. 54, 247 (1938).

M. Gaillard, P. Ceyzériat, A. Denis, and M. Dufay, Compt. Rend. 269B, 526 (1969).

K. Lidén, Arkiv Fysik 1, 229 (1949).

J. Reader and J. Sugar, Phys. Rev. 137, B784 (1965).

F. R. Rico, An. Real. Soc. espan. Fis. y Quim. A61, 113 (1960).

B. Edlén, in Handbuch der Physik 27, edited by S. Flügge (Springer, Berlin, 1964), p. 198.

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