Abstract

Films of uranium dioxide ranging in thickness from 132 to 280 mµ were evaporated onto fused silica, annealed at a pressure of 10<sup>-6</sup> mm Hg and 960°C, and measured for optical absorption between the wavelengths of 210 and 800 mµ. A moderately intense band observed at 240 to 500 mµ has an unsymmetrical shape with a maximum at about 318 mµ, an approximately linear part with a moderate negative slope between 318 and 380 mµ, and a large negative slope between 380 and 500 mµ. This broad band is undoubtedly at least two unresolved peaks. From 240 mµ to shorter wavelengths there is a very intense absorption band which is most probably the fundamental band for UO<sub>2</sub>. The extinction coefficient was found to vary from 0.0055±0.0007 at 650 mµ to a maximum of 0.3702±0.0010 at 360 mµ and to a value of 0.167±0.004 at 240 mµ. The index of refraction varied from 2.29±0.03 at 800 mµ to a maximum of 2.58±0.22 at 450 mµ. The effect of oxidation of the films within the UO<sub>2</sub> phase suggests that the one unresolved band at 430 mµ is removed by oxygen and the one at 300 mµ becomes more intense.

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  1. G. Hass and A. P. Bradford, J. Opt. Soc. Am. 47, 125 (1957).
  2. G. Hass, Vacuum II, 331 (1952).
  3. R. W. Johnson and D. C. Cronemeyer, Phys. Rev. 93, 634 (1954).
  4. G. Hass and C. D. Salzberg, J. Opt. Soc. Am. 44, 181 (1954).
  5. Ackermann, Gilles, and Thorn, J. Chem. Phys. 25, 1089 (1956).
  6. D. M. Gruen, J. Am. Chem. Soc. 76, 2117 (1954).
  7. Ackermann, Thorn, Alexander, and Tetenbaum, paper presented at the 135th National Meeting of the American Chemical Society (Boston, Massachusetts, April, 1959); J. Phys. Chem. (to be published).
  8. F. Grønvold, J. Inorg. Nuclear Chem. 1, 375 (1955).
  9. P. E. Blackburn, J. Phys. Chem. 62, 897 (1958).
  10. S. Aronson and J. Belle, J. Chem. Phys. 29, 151 (1958).49
  11. R. J. Ackermann and R. J. Thorn, Paper presented at the 133rd National Meeting of the American Chemical Society (San Francisco, California, April, 1958).
  12. O. S. Heavens, Optical Properties of Thin Solid Films (Academic Press, Inc., New York, 1955).
  13. R. J. Thorn and G. H. Winslow, J. Chem. Phys. 26, 186 (1957).
  14. Handbook of Chemtistry and Physics (Chemical Rubber Publishing Company, Cleveland, Ohio, 1956–1957), thirty-eighth edition, p. 2706.
  15. W. H. Brattain and H. B. Briggs, Phys. Rev. 75, 1705 (1949).
  16. Winslow, Thorn, and Ackermann, Bull. Am. Phys. Soc. Ser. II, 1, 341 (1956).

Ackermann, R. J.

R. J. Ackermann and R. J. Thorn, Paper presented at the 133rd National Meeting of the American Chemical Society (San Francisco, California, April, 1958).

Aronson, S.

S. Aronson and J. Belle, J. Chem. Phys. 29, 151 (1958).49

Belle, J.

S. Aronson and J. Belle, J. Chem. Phys. 29, 151 (1958).49

Blackburn, P. E.

P. E. Blackburn, J. Phys. Chem. 62, 897 (1958).

Bradford, A. P.

G. Hass and A. P. Bradford, J. Opt. Soc. Am. 47, 125 (1957).

Brattain, W. H.

W. H. Brattain and H. B. Briggs, Phys. Rev. 75, 1705 (1949).

Briggs, H. B.

W. H. Brattain and H. B. Briggs, Phys. Rev. 75, 1705 (1949).

Cronemeyer, D. C.

R. W. Johnson and D. C. Cronemeyer, Phys. Rev. 93, 634 (1954).

Grønvold, F.

F. Grønvold, J. Inorg. Nuclear Chem. 1, 375 (1955).

Gruen, D. M.

D. M. Gruen, J. Am. Chem. Soc. 76, 2117 (1954).

Hass, G.

G. Hass and A. P. Bradford, J. Opt. Soc. Am. 47, 125 (1957).

G. Hass and C. D. Salzberg, J. Opt. Soc. Am. 44, 181 (1954).

G. Hass, Vacuum II, 331 (1952).

Heavens, O. S.

O. S. Heavens, Optical Properties of Thin Solid Films (Academic Press, Inc., New York, 1955).

Johnson, R. W.

R. W. Johnson and D. C. Cronemeyer, Phys. Rev. 93, 634 (1954).

Salzberg, C. D.

G. Hass and C. D. Salzberg, J. Opt. Soc. Am. 44, 181 (1954).

Thorn, R. J.

R. J. Thorn and G. H. Winslow, J. Chem. Phys. 26, 186 (1957).

R. J. Ackermann and R. J. Thorn, Paper presented at the 133rd National Meeting of the American Chemical Society (San Francisco, California, April, 1958).

Winslow, G. H.

R. J. Thorn and G. H. Winslow, J. Chem. Phys. 26, 186 (1957).

Other

G. Hass and A. P. Bradford, J. Opt. Soc. Am. 47, 125 (1957).

G. Hass, Vacuum II, 331 (1952).

R. W. Johnson and D. C. Cronemeyer, Phys. Rev. 93, 634 (1954).

G. Hass and C. D. Salzberg, J. Opt. Soc. Am. 44, 181 (1954).

Ackermann, Gilles, and Thorn, J. Chem. Phys. 25, 1089 (1956).

D. M. Gruen, J. Am. Chem. Soc. 76, 2117 (1954).

Ackermann, Thorn, Alexander, and Tetenbaum, paper presented at the 135th National Meeting of the American Chemical Society (Boston, Massachusetts, April, 1959); J. Phys. Chem. (to be published).

F. Grønvold, J. Inorg. Nuclear Chem. 1, 375 (1955).

P. E. Blackburn, J. Phys. Chem. 62, 897 (1958).

S. Aronson and J. Belle, J. Chem. Phys. 29, 151 (1958).49

R. J. Ackermann and R. J. Thorn, Paper presented at the 133rd National Meeting of the American Chemical Society (San Francisco, California, April, 1958).

O. S. Heavens, Optical Properties of Thin Solid Films (Academic Press, Inc., New York, 1955).

R. J. Thorn and G. H. Winslow, J. Chem. Phys. 26, 186 (1957).

Handbook of Chemtistry and Physics (Chemical Rubber Publishing Company, Cleveland, Ohio, 1956–1957), thirty-eighth edition, p. 2706.

W. H. Brattain and H. B. Briggs, Phys. Rev. 75, 1705 (1949).

Winslow, Thorn, and Ackermann, Bull. Am. Phys. Soc. Ser. II, 1, 341 (1956).

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