Abstract

The emission spectrum of doubly ionized nitrogen, N iii, has been studied at high resolution in the extreme ultraviolet, from 150 to 500 Å. Eighty seven new terms are reported, belonging to singly, doubly, and triply excited electron configurations; the data include two hundred and fifteen new spectral lines. Many of the lines observed are due to transitions from autoionizing levels and some exhibit broad and asymmetrical profiles as predicted by the theory. An example of forced autoionization is noted.

© 1974 Optical Society of America

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References

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  1. S. G. Tilford and P. G. Wilkinson, J. Opt. Soc. Am. 54, 322 (1964).
    [CrossRef]
  2. S. G. Tilford, J. Opt. Soc. Am. 53, 1051 (1963).
    [CrossRef]
  3. D. J. Michels, S. G. Tilford, and J. W. Quinn, J. Opt. Soc. Am. 61, 625 (1971).
    [CrossRef]
  4. B. Edlén, Nova Acta Reg. Soc. Sci. Uppsala (IV) 9, No. 6 (1934).
  5. R. Hallin, Ark. Fys.  32, 201 (1966).
  6. B. Edlén, Z. Phys. 98, 561 (1936).
    [CrossRef]
  7. C. E. Moore, Ionization Potentials and Ionization Limits Derived from the Analysis of Optical Spectra, Natl. Bur. Stand. (U. S.), NSRDS–NBS 34 (U. S. Government Printing Office, Washington, D. C., 1970; available from the Superintendent of Documents, U. S. Government Printing Office, Washington, D. C. 20402; SD Catalog No. C 13.48:34).
  8. B. Edlén, H. P. Palenius, K. Bockasten, R. Hallin, and J. Bromander, Sol. Phys. 9, 432 (1969).
    [CrossRef]
  9. A. W. Weiss, Phys. Rev. 178, 82 (1969).
    [CrossRef]
  10. B. Edlén, in Handbuch der Physik XXVII, edited by S. Flügge (Springer, Berlin, 1964), p. 136ff.
  11. K. Eriksson and H. Isberg, Ark. Fys.  23, 527 (1963).
  12. C. E. Moore, Atomic Energy Levels Vol. I, Natl. Bur. Stand. (U. S.) Circ. No. 467 (U. S. Government Printing Office, Washington, D. C., 1949; availability as in Ref. 7).
  13. U. Fano, Phys. Rev. 124, 1866 (1961).
    [CrossRef]
  14. W. R. S. Garton, W. H. Parkinson, and E. M. Reeves, Proc. Phys. Soc. (Lond.) 80, 860 (1962).
    [CrossRef]
  15. B. H. Armstrong, J. Quant. Spectrosc. Radiat. Transfer 4, 207 (1964).
    [CrossRef]
  16. D. R. Inglis and E. Teller, Astrophys. J. 90, 439 (1939).
    [CrossRef]
  17. G. Boldt, Z. Phys. 154, 319 (1959).
    [CrossRef]
  18. G. Boldt, Z. Phys. 154, 330 (1959).
    [CrossRef]

1971 (1)

1969 (2)

B. Edlén, H. P. Palenius, K. Bockasten, R. Hallin, and J. Bromander, Sol. Phys. 9, 432 (1969).
[CrossRef]

A. W. Weiss, Phys. Rev. 178, 82 (1969).
[CrossRef]

1966 (1)

R. Hallin, Ark. Fys.  32, 201 (1966).

1964 (2)

B. H. Armstrong, J. Quant. Spectrosc. Radiat. Transfer 4, 207 (1964).
[CrossRef]

S. G. Tilford and P. G. Wilkinson, J. Opt. Soc. Am. 54, 322 (1964).
[CrossRef]

1963 (2)

S. G. Tilford, J. Opt. Soc. Am. 53, 1051 (1963).
[CrossRef]

K. Eriksson and H. Isberg, Ark. Fys.  23, 527 (1963).

1962 (1)

W. R. S. Garton, W. H. Parkinson, and E. M. Reeves, Proc. Phys. Soc. (Lond.) 80, 860 (1962).
[CrossRef]

1961 (1)

U. Fano, Phys. Rev. 124, 1866 (1961).
[CrossRef]

1959 (2)

G. Boldt, Z. Phys. 154, 319 (1959).
[CrossRef]

G. Boldt, Z. Phys. 154, 330 (1959).
[CrossRef]

1939 (1)

D. R. Inglis and E. Teller, Astrophys. J. 90, 439 (1939).
[CrossRef]

1936 (1)

B. Edlén, Z. Phys. 98, 561 (1936).
[CrossRef]

1934 (1)

B. Edlén, Nova Acta Reg. Soc. Sci. Uppsala (IV) 9, No. 6 (1934).

Armstrong, B. H.

B. H. Armstrong, J. Quant. Spectrosc. Radiat. Transfer 4, 207 (1964).
[CrossRef]

Bockasten, K.

B. Edlén, H. P. Palenius, K. Bockasten, R. Hallin, and J. Bromander, Sol. Phys. 9, 432 (1969).
[CrossRef]

Boldt, G.

G. Boldt, Z. Phys. 154, 319 (1959).
[CrossRef]

G. Boldt, Z. Phys. 154, 330 (1959).
[CrossRef]

Bromander, J.

B. Edlén, H. P. Palenius, K. Bockasten, R. Hallin, and J. Bromander, Sol. Phys. 9, 432 (1969).
[CrossRef]

Edlén, B.

B. Edlén, H. P. Palenius, K. Bockasten, R. Hallin, and J. Bromander, Sol. Phys. 9, 432 (1969).
[CrossRef]

B. Edlén, Z. Phys. 98, 561 (1936).
[CrossRef]

B. Edlén, Nova Acta Reg. Soc. Sci. Uppsala (IV) 9, No. 6 (1934).

B. Edlén, in Handbuch der Physik XXVII, edited by S. Flügge (Springer, Berlin, 1964), p. 136ff.

Eriksson, K.

K. Eriksson and H. Isberg, Ark. Fys.  23, 527 (1963).

Fano, U.

U. Fano, Phys. Rev. 124, 1866 (1961).
[CrossRef]

Garton, W. R. S.

W. R. S. Garton, W. H. Parkinson, and E. M. Reeves, Proc. Phys. Soc. (Lond.) 80, 860 (1962).
[CrossRef]

Hallin, R.

B. Edlén, H. P. Palenius, K. Bockasten, R. Hallin, and J. Bromander, Sol. Phys. 9, 432 (1969).
[CrossRef]

R. Hallin, Ark. Fys.  32, 201 (1966).

Inglis, D. R.

D. R. Inglis and E. Teller, Astrophys. J. 90, 439 (1939).
[CrossRef]

Isberg, H.

K. Eriksson and H. Isberg, Ark. Fys.  23, 527 (1963).

Michels, D. J.

Moore, C. E.

C. E. Moore, Atomic Energy Levels Vol. I, Natl. Bur. Stand. (U. S.) Circ. No. 467 (U. S. Government Printing Office, Washington, D. C., 1949; availability as in Ref. 7).

C. E. Moore, Ionization Potentials and Ionization Limits Derived from the Analysis of Optical Spectra, Natl. Bur. Stand. (U. S.), NSRDS–NBS 34 (U. S. Government Printing Office, Washington, D. C., 1970; available from the Superintendent of Documents, U. S. Government Printing Office, Washington, D. C. 20402; SD Catalog No. C 13.48:34).

Palenius, H. P.

B. Edlén, H. P. Palenius, K. Bockasten, R. Hallin, and J. Bromander, Sol. Phys. 9, 432 (1969).
[CrossRef]

Parkinson, W. H.

W. R. S. Garton, W. H. Parkinson, and E. M. Reeves, Proc. Phys. Soc. (Lond.) 80, 860 (1962).
[CrossRef]

Quinn, J. W.

Reeves, E. M.

W. R. S. Garton, W. H. Parkinson, and E. M. Reeves, Proc. Phys. Soc. (Lond.) 80, 860 (1962).
[CrossRef]

Teller, E.

D. R. Inglis and E. Teller, Astrophys. J. 90, 439 (1939).
[CrossRef]

Tilford, S. G.

Weiss, A. W.

A. W. Weiss, Phys. Rev. 178, 82 (1969).
[CrossRef]

Wilkinson, P. G.

Ark. Fys (2)

R. Hallin, Ark. Fys.  32, 201 (1966).

K. Eriksson and H. Isberg, Ark. Fys.  23, 527 (1963).

Astrophys. J. (1)

D. R. Inglis and E. Teller, Astrophys. J. 90, 439 (1939).
[CrossRef]

J. Opt. Soc. Am. (3)

J. Quant. Spectrosc. Radiat. Transfer (1)

B. H. Armstrong, J. Quant. Spectrosc. Radiat. Transfer 4, 207 (1964).
[CrossRef]

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

B. Edlén, Nova Acta Reg. Soc. Sci. Uppsala (IV) 9, No. 6 (1934).

Phys. Rev. (2)

A. W. Weiss, Phys. Rev. 178, 82 (1969).
[CrossRef]

U. Fano, Phys. Rev. 124, 1866 (1961).
[CrossRef]

Proc. Phys. Soc. (Lond.) (1)

W. R. S. Garton, W. H. Parkinson, and E. M. Reeves, Proc. Phys. Soc. (Lond.) 80, 860 (1962).
[CrossRef]

Sol. Phys. (1)

B. Edlén, H. P. Palenius, K. Bockasten, R. Hallin, and J. Bromander, Sol. Phys. 9, 432 (1969).
[CrossRef]

Z. Phys. (3)

G. Boldt, Z. Phys. 154, 319 (1959).
[CrossRef]

G. Boldt, Z. Phys. 154, 330 (1959).
[CrossRef]

B. Edlén, Z. Phys. 98, 561 (1936).
[CrossRef]

Other (3)

C. E. Moore, Ionization Potentials and Ionization Limits Derived from the Analysis of Optical Spectra, Natl. Bur. Stand. (U. S.), NSRDS–NBS 34 (U. S. Government Printing Office, Washington, D. C., 1970; available from the Superintendent of Documents, U. S. Government Printing Office, Washington, D. C. 20402; SD Catalog No. C 13.48:34).

B. Edlén, in Handbuch der Physik XXVII, edited by S. Flügge (Springer, Berlin, 1964), p. 136ff.

C. E. Moore, Atomic Energy Levels Vol. I, Natl. Bur. Stand. (U. S.) Circ. No. 467 (U. S. Government Printing Office, Washington, D. C., 1949; availability as in Ref. 7).

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Figures (3)

Fig. 1
Fig. 1

The doublet-term system of N iii.

Fig. 2
Fig. 2

The quartet-term system of N iii.

Fig. 3
Fig. 3

Forced autoionization in N iii. The vertical arrows mark the approximate positions of (a) onset of continuous radiation, (b) resonance center of the transition 2s22p 2P°–2s2p(3P°)4p 2D, and (c) the first ionization limit.

Tables (3)

Tables Icon

Table I Observed N iii lines in the region 150–500 Å.

Tables Icon

Table II Doublet-term system of N iii.

Tables Icon

Table III Quartet-term system of N iii.