Abstract

In very pure nitrogen, at high current and pressure, the relative intensities of the bands emitted by the positive column are reversed as compared with those emitted in the conventional discharge. The second positive system, although ordinarily dominating, may be completely suppressed and the N<sub>2</sub><sup>+</sup> bands strongly enhanced. We attribute the reversal to excitation and ionization in steps via metastable levels. Their low ionization potential limits the energy of the electrons. Possibly the reversal is enhanced by a selection rule. This process, excluding the second positive bands, is contrasted with processes exciting the same bands as the only visible system, namely, the blue afterglow and recombination of atoms on a copper surface. In these experiments, the first positive bands, although not observed, are inevitably excited by cascading but fail to exhibit strong vibration. This limits them to the infrared, visually unobservable range.

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  1. R. W. B. Pearse and A. G. Gaydon, Identification of Molecular Spectra, 3rd. ed. (Chapman and Hall, London, 1963), plate 3.
  2. D. C. Tyte and R. W. Nicholls, Atlas of Molecular Spectra (Univ. Western Ontario, London, Ont., Canada, 1964).
  3. Y. Tanaka and A. S. Jursa, J. Opt. Soc. Am. 51, 1239 (1961).
  4. H. Grenat, L. Herman, and G. Heppner, Ann. Géophys. 17, 351 (1961).
  5. R. C. M. Learner, personal communication.
  6. R. Bernard and R. Fouillouze, Compt. Rend. 209, 647 (1939).
  7. H. H. Brongersma and L. Oosterhoff, J. Chem. Phys. Letters 1, 169 (1967).
  8. L. Herman and R. Herman, in Proceedings of the Conference on Auroral Physics, edited by N. C. Gerson. Geophys. Res. Paper No. 30 (USAF Cambridge Research Center, Bedford, Mass., 1954), p. 221.
  9. H. H. Brömer and F. Döbler, Z. Physik 185, 278 (1965).
  10. R. B. Bryan, Ph.D. thesis, Harvard University, 1951; R. B. Bryan, R. B. Holt, and O. Oldenberg, Phys. Rev. 106, 83 (1957).
  11. H. H. Brömer and F. Spieweck, Z. Physik 184, 481 (1965).
  12. O. Oldenberg, J. Opt. Soc. Am. 61, 1092 (1971).
  13. P. Harteck, unpublished results.

Bernard, R.

R. Bernard and R. Fouillouze, Compt. Rend. 209, 647 (1939).

Brömer, H. H.

H. H. Brömer and F. Döbler, Z. Physik 185, 278 (1965).

H. H. Brömer and F. Spieweck, Z. Physik 184, 481 (1965).

Brongersma, H. H.

H. H. Brongersma and L. Oosterhoff, J. Chem. Phys. Letters 1, 169 (1967).

Bryan, R. B.

R. B. Bryan, Ph.D. thesis, Harvard University, 1951; R. B. Bryan, R. B. Holt, and O. Oldenberg, Phys. Rev. 106, 83 (1957).

Döbler, F.

H. H. Brömer and F. Döbler, Z. Physik 185, 278 (1965).

Fouillouze, R.

R. Bernard and R. Fouillouze, Compt. Rend. 209, 647 (1939).

Gaydon, A. G.

R. W. B. Pearse and A. G. Gaydon, Identification of Molecular Spectra, 3rd. ed. (Chapman and Hall, London, 1963), plate 3.

Grenat, H.

H. Grenat, L. Herman, and G. Heppner, Ann. Géophys. 17, 351 (1961).

Harteck, P.

P. Harteck, unpublished results.

Heppner, G.

H. Grenat, L. Herman, and G. Heppner, Ann. Géophys. 17, 351 (1961).

Herman, L.

H. Grenat, L. Herman, and G. Heppner, Ann. Géophys. 17, 351 (1961).

L. Herman and R. Herman, in Proceedings of the Conference on Auroral Physics, edited by N. C. Gerson. Geophys. Res. Paper No. 30 (USAF Cambridge Research Center, Bedford, Mass., 1954), p. 221.

Herman, R.

L. Herman and R. Herman, in Proceedings of the Conference on Auroral Physics, edited by N. C. Gerson. Geophys. Res. Paper No. 30 (USAF Cambridge Research Center, Bedford, Mass., 1954), p. 221.

Jursa, A. S.

Y. Tanaka and A. S. Jursa, J. Opt. Soc. Am. 51, 1239 (1961).

Learner, R. C. M.

R. C. M. Learner, personal communication.

Nicholls, R. W.

D. C. Tyte and R. W. Nicholls, Atlas of Molecular Spectra (Univ. Western Ontario, London, Ont., Canada, 1964).

Oldenberg, O.

O. Oldenberg, J. Opt. Soc. Am. 61, 1092 (1971).

Oosterhoff, L.

H. H. Brongersma and L. Oosterhoff, J. Chem. Phys. Letters 1, 169 (1967).

Pearse, R. W. B.

R. W. B. Pearse and A. G. Gaydon, Identification of Molecular Spectra, 3rd. ed. (Chapman and Hall, London, 1963), plate 3.

Spieweck, F.

H. H. Brömer and F. Spieweck, Z. Physik 184, 481 (1965).

Tanaka, Y.

Y. Tanaka and A. S. Jursa, J. Opt. Soc. Am. 51, 1239 (1961).

Tyte, D. C.

D. C. Tyte and R. W. Nicholls, Atlas of Molecular Spectra (Univ. Western Ontario, London, Ont., Canada, 1964).

Other

R. W. B. Pearse and A. G. Gaydon, Identification of Molecular Spectra, 3rd. ed. (Chapman and Hall, London, 1963), plate 3.

D. C. Tyte and R. W. Nicholls, Atlas of Molecular Spectra (Univ. Western Ontario, London, Ont., Canada, 1964).

Y. Tanaka and A. S. Jursa, J. Opt. Soc. Am. 51, 1239 (1961).

H. Grenat, L. Herman, and G. Heppner, Ann. Géophys. 17, 351 (1961).

R. C. M. Learner, personal communication.

R. Bernard and R. Fouillouze, Compt. Rend. 209, 647 (1939).

H. H. Brongersma and L. Oosterhoff, J. Chem. Phys. Letters 1, 169 (1967).

L. Herman and R. Herman, in Proceedings of the Conference on Auroral Physics, edited by N. C. Gerson. Geophys. Res. Paper No. 30 (USAF Cambridge Research Center, Bedford, Mass., 1954), p. 221.

H. H. Brömer and F. Döbler, Z. Physik 185, 278 (1965).

R. B. Bryan, Ph.D. thesis, Harvard University, 1951; R. B. Bryan, R. B. Holt, and O. Oldenberg, Phys. Rev. 106, 83 (1957).

H. H. Brömer and F. Spieweck, Z. Physik 184, 481 (1965).

O. Oldenberg, J. Opt. Soc. Am. 61, 1092 (1971).

P. Harteck, unpublished results.

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