Abstract

More or less uniform cells of ultraviolet transparent fused quartz about 1 µ thick and over 2 in. in diam have been produced and filled with sodium-potassium alloy, which is liquid at room temperature. These filters, while opaque in the visible, are transparent in the ultraviolet, with a cutoff wavelength lying between that for pure sodium (2100 A) and pure potassium (3400 A) and determined by the alloy composition. A tentative formula for the calculation of the cutoff wavelength is proposed and tested. The optical constants for the alloy were determined and are compared with those of the pure metals and with Kronig’s theory.

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  1. R. W. Wood, Phil. Mag. 38, 98 (1919).
  2. R. W. Wood, Phys. Rev. 44, 353 (1933).
  3. R. W. Wood and C. Lukens, Phys. Rev. 54, 332 (1938).
  4. R. W. Wood, Phil. Mag. 32, 364 (1916).
  5. H. M. O'Bryan, Rev. Sci. Instr. 6, 328 (1935).
  6. C. Zener, Nature 132, 968 (1933).
  7. R. Kronig, Nature 133, 211 (1934).
  8. R. Kronig, Proc. Roy. Soc. (London) A124, 409 (1929); 133, 255 (1931).
  9. J. A. Stratton, Electromagnetic Theory (McGraw-Hill Book Company, Inc., New York, 1941), p. 515, Eqs. (23) and (24).
  10. J. A. Stratton, reference 9, p, 506, Eq. (82).
  11. R. W. Engstrom, J. Opt. Soc. Am. 37, 420 (1947).
  12. The reflectivity was taken from the American Institute of Physics Handbook, edited by D. E. Gray (McGraw-Hill Book Company, Inc., New York, 1957), p. 6–108.
  13. H. E. Ives and H. B. Briggs, J. Opt. Soc. Am. 26, 238 (1936); 27, 181 (1937).
  14. F. Seitz, Modern Theory of Solids (McGraw-Hill Book Company, Inc., New York, 1940), p. 641, Eqs. (38) and (39).

Briggs, H. B.

H. E. Ives and H. B. Briggs, J. Opt. Soc. Am. 26, 238 (1936); 27, 181 (1937).

Engstrom, R. W.

R. W. Engstrom, J. Opt. Soc. Am. 37, 420 (1947).

Ives, H. E.

H. E. Ives and H. B. Briggs, J. Opt. Soc. Am. 26, 238 (1936); 27, 181 (1937).

Kronig, R.

R. Kronig, Nature 133, 211 (1934).

R. Kronig, Proc. Roy. Soc. (London) A124, 409 (1929); 133, 255 (1931).

Lukens, C.

R. W. Wood and C. Lukens, Phys. Rev. 54, 332 (1938).

O’Bryan, H. M.

H. M. O'Bryan, Rev. Sci. Instr. 6, 328 (1935).

Seitz, F.

F. Seitz, Modern Theory of Solids (McGraw-Hill Book Company, Inc., New York, 1940), p. 641, Eqs. (38) and (39).

Stratton, J. A.

J. A. Stratton, reference 9, p, 506, Eq. (82).

J. A. Stratton, Electromagnetic Theory (McGraw-Hill Book Company, Inc., New York, 1941), p. 515, Eqs. (23) and (24).

Wood, R. W.

R. W. Wood, Phys. Rev. 44, 353 (1933).

R. W. Wood, Phil. Mag. 38, 98 (1919).

R. W. Wood and C. Lukens, Phys. Rev. 54, 332 (1938).

R. W. Wood, Phil. Mag. 32, 364 (1916).

Zener, C.

C. Zener, Nature 132, 968 (1933).

Other (14)

R. W. Wood, Phil. Mag. 38, 98 (1919).

R. W. Wood, Phys. Rev. 44, 353 (1933).

R. W. Wood and C. Lukens, Phys. Rev. 54, 332 (1938).

R. W. Wood, Phil. Mag. 32, 364 (1916).

H. M. O'Bryan, Rev. Sci. Instr. 6, 328 (1935).

C. Zener, Nature 132, 968 (1933).

R. Kronig, Nature 133, 211 (1934).

R. Kronig, Proc. Roy. Soc. (London) A124, 409 (1929); 133, 255 (1931).

J. A. Stratton, Electromagnetic Theory (McGraw-Hill Book Company, Inc., New York, 1941), p. 515, Eqs. (23) and (24).

J. A. Stratton, reference 9, p, 506, Eq. (82).

R. W. Engstrom, J. Opt. Soc. Am. 37, 420 (1947).

The reflectivity was taken from the American Institute of Physics Handbook, edited by D. E. Gray (McGraw-Hill Book Company, Inc., New York, 1957), p. 6–108.

H. E. Ives and H. B. Briggs, J. Opt. Soc. Am. 26, 238 (1936); 27, 181 (1937).

F. Seitz, Modern Theory of Solids (McGraw-Hill Book Company, Inc., New York, 1940), p. 641, Eqs. (38) and (39).

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