Abstract

Light emanating from ac arcs operating on 60-Hz power exhibits a 120-Hz modulation of intensity. Although time-averaged spectra of such arcs are usually reported, the instantaneous light spectrum and its dependence on the oscillating plasma temperature is a more valuable source of spectroscopic information. An experimental technique is described for scanning the spectrum of an ac discharge at any fixed phase in the arc operating cycle. Spectra were recorded at phases corresponding to maximum and minimum light output for a pure Hg arc, a Hg-Na, Sc, Th metal-iodide arc, a Hg high-pressure Na arc, and a Hg-SnI<sub>2</sub> arc. Intensity ratios <i>I</i><sub>max</sub>/<i>I</i><sub>min</sub> of spectral lines generally increased with increasing upper-state energy. Many of the dominant lines also exhibited sizable changes of line profile with variations of phase. In the Hg-Na, Sc, Th metal-iodide arc, the intensity variations of optically thin lines were used to obtain estimates of upper-state energies and relative <i>gA</i> values of some Th lines for which these quantities were previously unknown.

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  1. W. Elenbaas, The High Pressure Mercury Vapor Discharge (North-Holland, Amsterdam, 1951).
  2. G. H. Reiling, J. Opt. Soc. Am. 54, 532 (1964).
  3. K. Schmidt, in Proceedings of Sixth International Conference on Ionization Phenomena in Gases (North-Holland, Amsterdam, 1963), p. 323.
  4. T. Higashi, L. Mori, and S. Nagano, in CIE Proceedings, Sixteenth Session, Washington, D. C., 1967 (Bureau Central CIE, 25 rue de Pépinière, Paris, 1968), p. 208.
  5. J. F. Waymouth, Electric Discharge Lamps (MIT Press, Cambridge, Mass., 1971).
  6. Boxcar Integrator model No. Cw-1 is a product of the Princeton Applied Research Corporation, Princeton, N. J.
  7. D. E. Rothe, Phys. Rev. 177, 93 (1969).
  8. R. J. Zollweg and L. S. Frost, in Proceedings of Eighth International Conference on Ionisation Phenomena in Gases (International Atomic Energy Agency, Vienna, 1967), p. 224.
  9. A. Adinarayana Murthy and P. B. V. Haranath, Curr. Sci. 38, 211 (1969).
  10. W. M. Vaidya and V. D. Dandawaite, J. Opt. Soc. Am. 56, 1963 (1966).
  11. R. Zalubas, New Description of Thorium Spectra, Natl. Bur. Std. (U. S.) Monograph No. 17 (U. S. Government Printing Office, Washington, D. C., 1960).
  12. C. H. Corliss and W. R. Bozman, Experimental Transition Probabilities far Spectral Lines of Seventy Elements, Natl. Bur. Std. (U. S.) Monograph No. 53 (U. S. Government Printing Office, Washington, D. C., 1962).

1969 (2)

D. E. Rothe, Phys. Rev. 177, 93 (1969).

A. Adinarayana Murthy and P. B. V. Haranath, Curr. Sci. 38, 211 (1969).

1967 (1)

R. J. Zollweg and L. S. Frost, in Proceedings of Eighth International Conference on Ionisation Phenomena in Gases (International Atomic Energy Agency, Vienna, 1967), p. 224.

1966 (1)

W. M. Vaidya and V. D. Dandawaite, J. Opt. Soc. Am. 56, 1963 (1966).

1964 (1)

G. H. Reiling, J. Opt. Soc. Am. 54, 532 (1964).

1962 (1)

C. H. Corliss and W. R. Bozman, Experimental Transition Probabilities far Spectral Lines of Seventy Elements, Natl. Bur. Std. (U. S.) Monograph No. 53 (U. S. Government Printing Office, Washington, D. C., 1962).

1960 (1)

R. Zalubas, New Description of Thorium Spectra, Natl. Bur. Std. (U. S.) Monograph No. 17 (U. S. Government Printing Office, Washington, D. C., 1960).

Bozman, W. R.

C. H. Corliss and W. R. Bozman, Experimental Transition Probabilities far Spectral Lines of Seventy Elements, Natl. Bur. Std. (U. S.) Monograph No. 53 (U. S. Government Printing Office, Washington, D. C., 1962).

Corliss, C. H.

C. H. Corliss and W. R. Bozman, Experimental Transition Probabilities far Spectral Lines of Seventy Elements, Natl. Bur. Std. (U. S.) Monograph No. 53 (U. S. Government Printing Office, Washington, D. C., 1962).

Dandawaite, V. D.

W. M. Vaidya and V. D. Dandawaite, J. Opt. Soc. Am. 56, 1963 (1966).

Elenbaas, W.

W. Elenbaas, The High Pressure Mercury Vapor Discharge (North-Holland, Amsterdam, 1951).

Frost, L. S.

R. J. Zollweg and L. S. Frost, in Proceedings of Eighth International Conference on Ionisation Phenomena in Gases (International Atomic Energy Agency, Vienna, 1967), p. 224.

Haranath, P. B. V.

A. Adinarayana Murthy and P. B. V. Haranath, Curr. Sci. 38, 211 (1969).

Higashi, T.

T. Higashi, L. Mori, and S. Nagano, in CIE Proceedings, Sixteenth Session, Washington, D. C., 1967 (Bureau Central CIE, 25 rue de Pépinière, Paris, 1968), p. 208.

Mori, L.

T. Higashi, L. Mori, and S. Nagano, in CIE Proceedings, Sixteenth Session, Washington, D. C., 1967 (Bureau Central CIE, 25 rue de Pépinière, Paris, 1968), p. 208.

Murthy, A. Adinarayana

A. Adinarayana Murthy and P. B. V. Haranath, Curr. Sci. 38, 211 (1969).

Nagano, S.

T. Higashi, L. Mori, and S. Nagano, in CIE Proceedings, Sixteenth Session, Washington, D. C., 1967 (Bureau Central CIE, 25 rue de Pépinière, Paris, 1968), p. 208.

Reiling, G. H.

G. H. Reiling, J. Opt. Soc. Am. 54, 532 (1964).

Rothe, D. E.

D. E. Rothe, Phys. Rev. 177, 93 (1969).

Schmidt, K.

K. Schmidt, in Proceedings of Sixth International Conference on Ionization Phenomena in Gases (North-Holland, Amsterdam, 1963), p. 323.

Vaidya, W. M.

W. M. Vaidya and V. D. Dandawaite, J. Opt. Soc. Am. 56, 1963 (1966).

Waymouth, J. F.

J. F. Waymouth, Electric Discharge Lamps (MIT Press, Cambridge, Mass., 1971).

Zalubas, R.

R. Zalubas, New Description of Thorium Spectra, Natl. Bur. Std. (U. S.) Monograph No. 17 (U. S. Government Printing Office, Washington, D. C., 1960).

Zollweg, R. J.

R. J. Zollweg and L. S. Frost, in Proceedings of Eighth International Conference on Ionisation Phenomena in Gases (International Atomic Energy Agency, Vienna, 1967), p. 224.

Other (12)

W. Elenbaas, The High Pressure Mercury Vapor Discharge (North-Holland, Amsterdam, 1951).

G. H. Reiling, J. Opt. Soc. Am. 54, 532 (1964).

K. Schmidt, in Proceedings of Sixth International Conference on Ionization Phenomena in Gases (North-Holland, Amsterdam, 1963), p. 323.

T. Higashi, L. Mori, and S. Nagano, in CIE Proceedings, Sixteenth Session, Washington, D. C., 1967 (Bureau Central CIE, 25 rue de Pépinière, Paris, 1968), p. 208.

J. F. Waymouth, Electric Discharge Lamps (MIT Press, Cambridge, Mass., 1971).

Boxcar Integrator model No. Cw-1 is a product of the Princeton Applied Research Corporation, Princeton, N. J.

D. E. Rothe, Phys. Rev. 177, 93 (1969).

R. J. Zollweg and L. S. Frost, in Proceedings of Eighth International Conference on Ionisation Phenomena in Gases (International Atomic Energy Agency, Vienna, 1967), p. 224.

A. Adinarayana Murthy and P. B. V. Haranath, Curr. Sci. 38, 211 (1969).

W. M. Vaidya and V. D. Dandawaite, J. Opt. Soc. Am. 56, 1963 (1966).

R. Zalubas, New Description of Thorium Spectra, Natl. Bur. Std. (U. S.) Monograph No. 17 (U. S. Government Printing Office, Washington, D. C., 1960).

C. H. Corliss and W. R. Bozman, Experimental Transition Probabilities far Spectral Lines of Seventy Elements, Natl. Bur. Std. (U. S.) Monograph No. 53 (U. S. Government Printing Office, Washington, D. C., 1962).

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