Abstract

Films of uranium dioxide ranging in thickness from 132 to 280 mµ were evaporated onto fused silica, annealed at a pressure of 10−6 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 UO2. 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 UO2 phase suggests that the one unresolved band at 430 mµ is removed by oxygen and the one at 300 mµ becomes more intense.

© 1959 Optical Society of America

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References

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  1. G. Hass and A. P. Bradford, J. Opt. Soc. Am. 47, 125 (1957).
    [CrossRef]
  2. G. Hass, Vacuum II, 331 (1952).
    [CrossRef]
  3. R. W. Johnson and D. C. Cronemeyer, Phys. Rev. 93, 634 (1954).
    [CrossRef]
  4. G. Hass and C. D. Salzberg, J. Opt. Soc. Am. 44, 181 (1954).
    [CrossRef]
  5. Ackermann, Gilles, and Thorn, J. Chem. Phys. 25, 1089 (1956).
    [CrossRef]
  6. D. M. Gruen, J. Am Chem. Soc. 76, 2117 (1954).
    [CrossRef]
  7. Ackermann, Thorn, Alexander, and Tetenbaum, paper presented at the 135th National Meeting of theAmerican 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).
    [CrossRef]
  10. S. Aronson and J. Belle, J. Chem. Phys. 29, 151 (1958).
    [CrossRef]
  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).
    [CrossRef]
  14. Handbook of Chemistry 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).
    [CrossRef]
  16. Winslow, Thorn, and Ackermann, Bull. Am. Phys. Soc. Ser· II,  1, 341 (1956).

1958 (2)

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

S. Aronson and J. Belle, J. Chem. Phys. 29, 151 (1958).
[CrossRef]

1957 (2)

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

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

1956 (2)

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

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

1955 (1)

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

1954 (3)

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

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

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

1952 (1)

G. Hass, Vacuum II, 331 (1952).
[CrossRef]

1949 (1)

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

Ackermann,

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

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

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

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).

Alexander,

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

Aronson, S.

S. Aronson and J. Belle, J. Chem. Phys. 29, 151 (1958).
[CrossRef]

Belle, J.

S. Aronson and J. Belle, J. Chem. Phys. 29, 151 (1958).
[CrossRef]

Blackburn, P. E.

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

Bradford, A. P.

Brattain, W. H.

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

Briggs, H. B.

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

Cronemeyer, D. C.

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

Gilles,

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

Grønvold, F.

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

Gruen, D. M.

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

Hass, G.

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).
[CrossRef]

Salzberg, C. D.

Tetenbaum,

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

Thorn,

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

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

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

Thorn, R. J.

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

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,

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

Winslow, G. H.

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

Bull. Am. Phys. Soc. Ser· II (1)

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

J. Am Chem. Soc. (1)

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

J. Chem. Phys. (3)

S. Aronson and J. Belle, J. Chem. Phys. 29, 151 (1958).
[CrossRef]

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

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

J. Inorg. Nuclear Chem. (1)

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

J. Opt. Soc. Am. (2)

J. Phys. Chem. (1)

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

Phys. Rev. (2)

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

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

Vacuum (1)

G. Hass, Vacuum II, 331 (1952).
[CrossRef]

Other (4)

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

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

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).

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Figures (7)

F. 1
F. 1

Optical density of UO2+x films as a function of wavelength at various film thicknesses.

F. 2
F. 2

Variation of optical density of UO2 film with time of deposition on fused silica. Reciprocal apparent temperature 10 4 T a.

F. 3
F. 3

Effect of high-temperature oxidation of UO2 on optical density vs wavelength. Note.—“Oxygen uranium ratios” should read “Oxygen/uranium ratios.”

F. 4
F. 4

Effect of room-temperature oxidation on optical density vs wavelength.

F. 5
F. 5

Effect of low-temperature oxidation of UO2 on optical density vs wavelength.

F. 6
F. 6

Optical density vs thickness (α counts/min) for several wavelengths.

F. 7
F. 7

Index of refraction and extinction coefficient as a function of energy. The computer was unable to determine sensible values of the index in the region of high absorption, so none is plotted. The solid lines satisfy the Krönig-Kramers relations. They were based on the experimental results approximately corrected for the tail of the high peak beyond 5.5 ev. The principal group of points was based on an independent determination of the film density. Those plotted as square points were found along with a simultaneous determination of the density (see Table II). Index of refraction, or extinction coefficient × 10.

Tables (2)

Tables Icon

Table II Index of refraction and extinction coefficient vs wavelength for UO2 films.

Equations (4)

Equations on this page are rendered with MathJax. Learn more.

T 1 = a exp ( k x ) b cos ( β x ) + c sin ( β x ) + d exp ( k x ) .
k = 4 π K / λ ,
β = 4 π n / λ ,
n 2 ( ν ) K 2 ( ν ) = ( 2 / π ) 0 [ 2 n ( ξ ) K ( ξ ) ξ d ξ ] / ( ξ 2 ν 2 ) .