Abstract

Asymmetric autoionized lines have been observed for the first time in an atomic emission spectrum. Several members of the 2s22p2 3P–2s2p2(4P)np 3D° Rydberg series have been observed which interact with the 2s22p(2P0)nd 3D° continuum beyond the first ionization limit, 2s22pP212°, in the triplet levels of O iii. Symmetric autoionized lines of the 2s22p2 3P–2s 2p2(4P)np 3P° Rydberg series have also been observed in this same spectrum.

© 1964 Optical Society of America

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References

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  1. U. Fano, Phys. Rev. 124, 1866 (1961).
    [Crossref]
  2. H. Beutler, Z. Physik 93, 177 (1935).
    [Crossref]
  3. R. E. Huffman, Y. Tanaka, and J. C. Larrabee, Appl. Opt. 2, 947 (1963).
    [Crossref]
  4. W. R. S. Garton and K. Codling, Proc. Phys. Soc. (London) A75, 87 (1960).
    [Crossref]
  5. W. R. S. Garton, J. Quant. Spectry. Radiation Transfer 2, 335 (1962).
    [Crossref]
  6. R. W. Ditchburn and R. D. Hudson, Proc. Roy. Soc. (London) A256, 53 (1960).
  7. R. P. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).
    [Crossref]
  8. A. G. Shenstone, Phil. Trans. Roy. Soc. (London) A241, 297 (1948); Phys. Rev. 57, 894 (1940).
  9. B. Edlén, Handbuch der Physik 27, 80 (1963).
  10. S. G. Tilford, J. Opt. Soc. Am. 53, 1051 (1963).
    [Crossref]
  11. The Matheson Company Inc., P. O. Box 85, East Rutherford, New Jersey.
  12. B. Edlén, Nova Acta Regiae Soc. Sci. Upsaliensis 9, 103 (1934).
  13. C. E. Moore, Natl. Bur. Std. (U.S.), Circ. 467, Vol.  III (1958) (corrected value quoted for ionization limit of O III; the value quoted in Vol. I is too high by 387 cm−1).
  14. (1 eV=8066.03 cm−1), E. R. Cohen, J. W. Dumond, T. W. Layton, and J. S. Rollet, Rev. Mod. Phys. 27, 363 (1955).
    [Crossref]
  15. It may be that the first ionization potential is lowered by conditions within the source 16 such that the 2s 2p2(4P)4p3D° level now falls well above the actual limit. This phenomenon of forced ionization has been observed in the absorption spectrum of shock-excited barium by Garton, Parkinson, and Reeves.17
  16. H. Margenau and M. Lewis, Rev. Mod. Phys. 31, 569 (1959).
    [Crossref]
  17. W. R. S. Garton, W. H. Parkinson, and E. M. Reeves, Proc. Phys. Soc. (London) 80, 860 (1962).
    [Crossref]
  18. C. E. Moore, Natl. Bur. Standards (U. S.), Circ. 467, Vol.  I (1949).
  19. The lines converging to the 2s22p ²P12° limit, Fig. 5, are rather broad. Part of these widths result from almost superposition of several transitions (26 lines have been observed in the peak at 248 Å). Conditions in the source might also contribute to the widths of the lines. When levels below the lowest idealized ionization potential belong to a series in which higher members are able to autoionize, higher members of series levels converging to this first limit are expected to become drowned in their own limiting continuum.16,17 Also the merging of states16 possibly contribute to the width of these lines. Additional work is necessary to determine the contributions from each of these possibilities.

1963 (4)

R. P. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).
[Crossref]

B. Edlén, Handbuch der Physik 27, 80 (1963).

R. E. Huffman, Y. Tanaka, and J. C. Larrabee, Appl. Opt. 2, 947 (1963).
[Crossref]

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

1962 (2)

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

W. R. S. Garton, J. Quant. Spectry. Radiation Transfer 2, 335 (1962).
[Crossref]

1961 (1)

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

1960 (2)

W. R. S. Garton and K. Codling, Proc. Phys. Soc. (London) A75, 87 (1960).
[Crossref]

R. W. Ditchburn and R. D. Hudson, Proc. Roy. Soc. (London) A256, 53 (1960).

1959 (1)

H. Margenau and M. Lewis, Rev. Mod. Phys. 31, 569 (1959).
[Crossref]

1958 (1)

C. E. Moore, Natl. Bur. Std. (U.S.), Circ. 467, Vol.  III (1958) (corrected value quoted for ionization limit of O III; the value quoted in Vol. I is too high by 387 cm−1).

1955 (1)

(1 eV=8066.03 cm−1), E. R. Cohen, J. W. Dumond, T. W. Layton, and J. S. Rollet, Rev. Mod. Phys. 27, 363 (1955).
[Crossref]

1949 (1)

C. E. Moore, Natl. Bur. Standards (U. S.), Circ. 467, Vol.  I (1949).

1948 (1)

A. G. Shenstone, Phil. Trans. Roy. Soc. (London) A241, 297 (1948); Phys. Rev. 57, 894 (1940).

1935 (1)

H. Beutler, Z. Physik 93, 177 (1935).
[Crossref]

1934 (1)

B. Edlén, Nova Acta Regiae Soc. Sci. Upsaliensis 9, 103 (1934).

Beutler, H.

H. Beutler, Z. Physik 93, 177 (1935).
[Crossref]

Codling, K.

R. P. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).
[Crossref]

W. R. S. Garton and K. Codling, Proc. Phys. Soc. (London) A75, 87 (1960).
[Crossref]

Cohen, E. R.

(1 eV=8066.03 cm−1), E. R. Cohen, J. W. Dumond, T. W. Layton, and J. S. Rollet, Rev. Mod. Phys. 27, 363 (1955).
[Crossref]

Ditchburn, R. W.

R. W. Ditchburn and R. D. Hudson, Proc. Roy. Soc. (London) A256, 53 (1960).

Dumond, J. W.

(1 eV=8066.03 cm−1), E. R. Cohen, J. W. Dumond, T. W. Layton, and J. S. Rollet, Rev. Mod. Phys. 27, 363 (1955).
[Crossref]

Edlén, B.

B. Edlén, Handbuch der Physik 27, 80 (1963).

B. Edlén, Nova Acta Regiae Soc. Sci. Upsaliensis 9, 103 (1934).

Fano, U.

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

Garton, W. R. S.

W. R. S. Garton, J. Quant. Spectry. Radiation Transfer 2, 335 (1962).
[Crossref]

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

W. R. S. Garton and K. Codling, Proc. Phys. Soc. (London) A75, 87 (1960).
[Crossref]

Hudson, R. D.

R. W. Ditchburn and R. D. Hudson, Proc. Roy. Soc. (London) A256, 53 (1960).

Huffman, R. E.

Larrabee, J. C.

Layton, T. W.

(1 eV=8066.03 cm−1), E. R. Cohen, J. W. Dumond, T. W. Layton, and J. S. Rollet, Rev. Mod. Phys. 27, 363 (1955).
[Crossref]

Lewis, M.

H. Margenau and M. Lewis, Rev. Mod. Phys. 31, 569 (1959).
[Crossref]

Madden, R. P.

R. P. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).
[Crossref]

Margenau, H.

H. Margenau and M. Lewis, Rev. Mod. Phys. 31, 569 (1959).
[Crossref]

Moore, C. E.

C. E. Moore, Natl. Bur. Std. (U.S.), Circ. 467, Vol.  III (1958) (corrected value quoted for ionization limit of O III; the value quoted in Vol. I is too high by 387 cm−1).

C. E. Moore, Natl. Bur. Standards (U. S.), Circ. 467, Vol.  I (1949).

Parkinson, W. H.

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

Reeves, E. M.

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

Rollet, J. S.

(1 eV=8066.03 cm−1), E. R. Cohen, J. W. Dumond, T. W. Layton, and J. S. Rollet, Rev. Mod. Phys. 27, 363 (1955).
[Crossref]

Shenstone, A. G.

A. G. Shenstone, Phil. Trans. Roy. Soc. (London) A241, 297 (1948); Phys. Rev. 57, 894 (1940).

Tanaka, Y.

Tilford, S. G.

Appl. Opt. (1)

Handbuch der Physik (1)

B. Edlén, Handbuch der Physik 27, 80 (1963).

J. Opt. Soc. Am. (1)

J. Quant. Spectry. Radiation Transfer (1)

W. R. S. Garton, J. Quant. Spectry. Radiation Transfer 2, 335 (1962).
[Crossref]

Natl. Bur. Standards (U. S.), Circ. 467 (1)

C. E. Moore, Natl. Bur. Standards (U. S.), Circ. 467, Vol.  I (1949).

Natl. Bur. Std. (U.S.), Circ. 467 (1)

C. E. Moore, Natl. Bur. Std. (U.S.), Circ. 467, Vol.  III (1958) (corrected value quoted for ionization limit of O III; the value quoted in Vol. I is too high by 387 cm−1).

Nova Acta Regiae Soc. Sci. Upsaliensis (1)

B. Edlén, Nova Acta Regiae Soc. Sci. Upsaliensis 9, 103 (1934).

Phil. Trans. Roy. Soc. (London) (1)

A. G. Shenstone, Phil. Trans. Roy. Soc. (London) A241, 297 (1948); Phys. Rev. 57, 894 (1940).

Phys. Rev. (1)

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

Phys. Rev. Letters (1)

R. P. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).
[Crossref]

Proc. Phys. Soc. (London) (2)

W. R. S. Garton and K. Codling, Proc. Phys. Soc. (London) A75, 87 (1960).
[Crossref]

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

Proc. Roy. Soc. (London) (1)

R. W. Ditchburn and R. D. Hudson, Proc. Roy. Soc. (London) A256, 53 (1960).

Rev. Mod. Phys. (2)

H. Margenau and M. Lewis, Rev. Mod. Phys. 31, 569 (1959).
[Crossref]

(1 eV=8066.03 cm−1), E. R. Cohen, J. W. Dumond, T. W. Layton, and J. S. Rollet, Rev. Mod. Phys. 27, 363 (1955).
[Crossref]

Z. Physik (1)

H. Beutler, Z. Physik 93, 177 (1935).
[Crossref]

Other (3)

It may be that the first ionization potential is lowered by conditions within the source 16 such that the 2s 2p2(4P)4p3D° level now falls well above the actual limit. This phenomenon of forced ionization has been observed in the absorption spectrum of shock-excited barium by Garton, Parkinson, and Reeves.17

The Matheson Company Inc., P. O. Box 85, East Rutherford, New Jersey.

The lines converging to the 2s22p ²P12° limit, Fig. 5, are rather broad. Part of these widths result from almost superposition of several transitions (26 lines have been observed in the peak at 248 Å). Conditions in the source might also contribute to the widths of the lines. When levels below the lowest idealized ionization potential belong to a series in which higher members are able to autoionize, higher members of series levels converging to this first limit are expected to become drowned in their own limiting continuum.16,17 Also the merging of states16 possibly contribute to the width of these lines. Additional work is necessary to determine the contributions from each of these possibilities.

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Figures (5)

Fig. 1
Fig. 1

Microphotometer traces of the spectra of atomic oxygen in the region 223–230 Å. Dashed arrows indicate lines of O v and solid arrows indicate lines of O iv. All other lines belong to O iii.

Fig. 2
Fig. 2

Spectrograms showing the influence of flow rate on the excitation of atomic oxygen at a pressure of 100 μ. The lower spectrogram was obtained using a much faster flow rate through the discharge tube than that for the upper spectrogram (see Sec. II).

Fig. 3
Fig. 3

Energy level diagram for the triplet terms of O iii.

Fig. 4
Fig. 4

Spectrograms showing several asymmetrical autoionized emission lines in O iii.

Fig. 5
Fig. 5

Microphotometer trace of the spectrum of O iii from 190–250 Å. The solid lines at the top of the figure indicate members of the 2s22p2 3P–2s22p(2P0)nd 3D° Rydberg series; the dotted lines indicate members of the asymmetric autoionized 2s22p2 3P–2s2p2(4P)np 3D° Rydberg series.