Abstract

Passage of far-ultraviolet radiation (1050-2000 Å) through the imperfect vacuum maintained by mechanical and oil-diffusion pumps results in the buildup of films opaque to far-uv radiation. Such films quickly coat lamp windows and other optical surfaces. The films can be removed by washing with petroleum ether or by exposure of affected surfaces to a hydrogen gas discharge. Transmittance vs time studies support the view that the films are produced from photodissociated vacuum-pump oil molecules. Passage of 2×10<sup>15</sup> photons cm<sup>-2</sup> through a 2.5-cm gap maintained at 10<sup>-4</sup> Torr pressure results in two films of 50% combined transmittance measured at about 1200 Å.

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References

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  1. Frederic Palmer, Jr., J. Chem. Phys. 2, 292 (1934).
  2. P. Warneck, Appl. Opt. 1, 721, (1962).
  3. J. M. Young, U. S. Naval Research Laboratory, Washington, D. C. (private communication).

Palmer, Jr., Frederic

Frederic Palmer, Jr., J. Chem. Phys. 2, 292 (1934).

Warneck, P.

P. Warneck, Appl. Opt. 1, 721, (1962).

Young, J. M.

J. M. Young, U. S. Naval Research Laboratory, Washington, D. C. (private communication).

Other (3)

Frederic Palmer, Jr., J. Chem. Phys. 2, 292 (1934).

P. Warneck, Appl. Opt. 1, 721, (1962).

J. M. Young, U. S. Naval Research Laboratory, Washington, D. C. (private communication).

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