Abstract

Possible changes of intensity of cadmium arc lines, emitted from different upper energy states, have been calculated on the basis of thermal equilibrium for two definite temperatures of the arc due to variation of the arc current. The arc temperatures were measured with optical pyrometers. Large discrepancies were noted between the calculated and observed values. The results call for a considerable amount of collisional excitation.

© 1956 Optical Society of America

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References

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  1. Ornstein, Van Hengstum, and Brinkman, Physica 5, 145 (1938).
    [Crossref]
  2. A. E. Ruark, J. Opt. Soc. Am. 11, 199 (1925); C. L. Albright, Phys. Rev. 36, 847 (1940); S. Goudsmit, Naturwissenschaften 17, 805 (1929); H. Schüler and H. Brück, Z. Physik 58, 735 (1929).
    [Crossref]
  3. F. Backer and S. Goudsmit, Atomic Energy States (McGraw-Hill Book Company, Inc., New York, 1932), p. 129.

1938 (1)

Ornstein, Van Hengstum, and Brinkman, Physica 5, 145 (1938).
[Crossref]

1925 (1)

Backer, F.

F. Backer and S. Goudsmit, Atomic Energy States (McGraw-Hill Book Company, Inc., New York, 1932), p. 129.

Brinkman,

Ornstein, Van Hengstum, and Brinkman, Physica 5, 145 (1938).
[Crossref]

Goudsmit, S.

F. Backer and S. Goudsmit, Atomic Energy States (McGraw-Hill Book Company, Inc., New York, 1932), p. 129.

Ornstein,

Ornstein, Van Hengstum, and Brinkman, Physica 5, 145 (1938).
[Crossref]

Ruark, A. E.

Van Hengstum,

Ornstein, Van Hengstum, and Brinkman, Physica 5, 145 (1938).
[Crossref]

J. Opt. Soc. Am. (1)

Physica (1)

Ornstein, Van Hengstum, and Brinkman, Physica 5, 145 (1938).
[Crossref]

Other (1)

F. Backer and S. Goudsmit, Atomic Energy States (McGraw-Hill Book Company, Inc., New York, 1932), p. 129.

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Tables (1)

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Table I Expected intensity ratio from thermal equilibrium and the observed intensity ratio.

Equations (1)

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exp ( - h ν x / K T 1 ) / exp ( - h ν x / K T 2 ) = exp [ - h ( T 2 - T 1 ) k T 1 T 2 · ν x ] .