Abstract

The ultraviolet characteristics of a 0.5-kw d.c. arc through high pressure xenon were investigated. The lamp has a quartz envelope and contains pure xenon under a pressure of roughly 20 atmospheres when operating; its general characteristics have been described by Schulz. The absolute spectral radiance between 2000A and 5000A was measured photographically by comparison with the positive crater of a spectroscopically pure carbon arc. An ultraviolet radiance contour map of the arc stream was obtained by analysis of direct photographs. It was found that the lamp radiates a smooth ultraviolet continuum, which extends to the air cut-off and is interrupted by only a few weak lines. The radiance of the central spot exceeds that of the carbon crater by a factor of 23 at 2500A, 12 at 3000A, and 6 at 3500A. Comparison with other ultraviolet-continuum sources shows the xenon arc to be unusually intense.

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  1. P. Schulz, Zeits. f. Naturforschung 2a, 583 (1947); Ann. d. Physik 1, 95 (1947); Ann. d. Physik 1, 107 (1947).
  2. H. G. MacPherson, J. Opt. Soc. Am. 30, 189 (1940).
  3. A. S. Allen and R. G. Franklin, J. Opt. Soc. Am. 29, 453 (1939).
  4. C. H. Matz and D. P. Merrill, J. Opt. Soc. Am. 39, 635A (1949).

Allen, A. S.

A. S. Allen and R. G. Franklin, J. Opt. Soc. Am. 29, 453 (1939).

Franklin, R. G.

A. S. Allen and R. G. Franklin, J. Opt. Soc. Am. 29, 453 (1939).

MacPherson, H. G.

H. G. MacPherson, J. Opt. Soc. Am. 30, 189 (1940).

Matz, C. H.

C. H. Matz and D. P. Merrill, J. Opt. Soc. Am. 39, 635A (1949).

Merrill, D. P.

C. H. Matz and D. P. Merrill, J. Opt. Soc. Am. 39, 635A (1949).

Schulz, P.

P. Schulz, Zeits. f. Naturforschung 2a, 583 (1947); Ann. d. Physik 1, 95 (1947); Ann. d. Physik 1, 107 (1947).

Other (4)

P. Schulz, Zeits. f. Naturforschung 2a, 583 (1947); Ann. d. Physik 1, 95 (1947); Ann. d. Physik 1, 107 (1947).

H. G. MacPherson, J. Opt. Soc. Am. 30, 189 (1940).

A. S. Allen and R. G. Franklin, J. Opt. Soc. Am. 29, 453 (1939).

C. H. Matz and D. P. Merrill, J. Opt. Soc. Am. 39, 635A (1949).

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