Abstract

The reflectances of evaporated films of Li were measured as functions of angle of incidence for photon energies between 3 and 10.7 eV, and were analyzed, by use of Fresnel’s equations, to determine the optical constants <i>n</i> and <i>k</i> for each energy. Above 6 eV, measurements with photons incident on both vacuum and substrate surfaces gave the same values of <i>n</i> and <i>k</i> within experimental limits of about ±5%. Below 6 eV, values of <i>n</i> and <i>k</i> obtained from the analysis were not reproducible; they depend in a complex way on film thickness, light polarization, and surface structure. Failure of the analysis below 6 eV is attributed to surface-roughness effects on the <i>R</i> (θ) curves, which are not accounted for in Fresnel’s equations. These effects are believed to be small above 6 eV. The dielectric function ε<sub>1</sub>, and ε<sub>2</sub> and the energy-loss function Im(-1/ε) were determined from <i>n</i> and <i>k</i> for photon energies above 6 eV. The plasma energy of Li, as determined from the condition ε<sub>1</sub> (ω)=0, is 6.7 eV; and the plasma loss peak in Im(-1/ε) is centered at 7.1 eV. In contrast to results for the heavy alkali metals K, Rb, and Cs, no evidence was found for an optical-absorption peak in ε<sub>2</sub> in the spectral region above the plasma frequency.

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  1. J. C. Sutherland and E. T. Arakawa, J. Opt. Soc. Am. 57, 645 (1967); J. Opt. Soc. Am. 53, 1080 (1968); J. C. Sutherland, R. N. Hamm, and E. T. Arakawa, J. Opt. Soc. Am. 59, 1581 (1969).R. N. Hamm, and E. T. Arakawa, J. Opt. Soc. Am. 59,1581 (1969).
  2. U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. B 6, 2109 (1972).
  3. U. S. Whang, E. T. Arakawa and T. A. Callcott, Phys. Rev. B 5, 2118 (1972).
  4. U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. Lett. 25, 646 (1970); J. Opt. Soc. Am. 61, 740 (1971).
  5. Monique Rasigni and Georges Rasigni, J. Opt. Soc. Am. 62, 1033 (1972); J. Opt. Soc. Am. 63, 775 (1973).
  6. W. Y. Ching and J. Calloway, Phys. Rev. Lett. 30, 441 (1973).
  7. R. N. Hamm, R. A. MacRae, and E. T. Arakawa, J. Opt. Soc. Am. 55, 1460 (1965).
  8. W. R. Hunter, J. Opt. Soc. Am. 54, 15 (1964); J. Opt. Soc. Am. 55, 1197 (1965).
  9. A. Otto, Z. Phys. 216, 398 (1968); Phys. Stat. Sol. 42, K37 (1970); also see E. Kretschmann. Z. Phys. 241, 313 (1971).
  10. U S. Whang, E. T. Arakawa, R. N. Hamm, and M. W. Williams, J. Opt. Soc. Am. 63, 305 (1973).
  11. J. Crowell and R. H. Ritchie, J. Opt. Soc. Am. 6, 794 (1970); also see J. M. Elson and R. H. Ritchie, Phys. Rev. B 4, 4129 (1971).
  12. C. Macek, A. Otto, and W. Steinmann, Phys. Stat. Sol. 51, K59 (1972).
  13. A. J. Braundmeier and E. T. Arakawa, J. Phys. Chem. Solids 35, 517 (1974).
  14. J. Bösenberg, Phys. Lett. 41A, 185 (1972).
  15. J. N. Hodgson, in Optical Properties and Electronic Structure of Metals and Alloys, edited by F. Abelès (North–Holland, Amsterdam, 1966), p. 60.
  16. C. Kunz, Z. Phys. 196, 311 (1966).

Arakawa, E. T.

J. C. Sutherland and E. T. Arakawa, J. Opt. Soc. Am. 57, 645 (1967); J. Opt. Soc. Am. 53, 1080 (1968); J. C. Sutherland, R. N. Hamm, and E. T. Arakawa, J. Opt. Soc. Am. 59, 1581 (1969).R. N. Hamm, and E. T. Arakawa, J. Opt. Soc. Am. 59,1581 (1969).

U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. B 6, 2109 (1972).

U. S. Whang, E. T. Arakawa and T. A. Callcott, Phys. Rev. B 5, 2118 (1972).

U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. Lett. 25, 646 (1970); J. Opt. Soc. Am. 61, 740 (1971).

R. N. Hamm, R. A. MacRae, and E. T. Arakawa, J. Opt. Soc. Am. 55, 1460 (1965).

U S. Whang, E. T. Arakawa, R. N. Hamm, and M. W. Williams, J. Opt. Soc. Am. 63, 305 (1973).

A. J. Braundmeier and E. T. Arakawa, J. Phys. Chem. Solids 35, 517 (1974).

Bösenberg, J.

J. Bösenberg, Phys. Lett. 41A, 185 (1972).

Braundmeier, A. J.

A. J. Braundmeier and E. T. Arakawa, J. Phys. Chem. Solids 35, 517 (1974).

Callcott, T. A.

U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. Lett. 25, 646 (1970); J. Opt. Soc. Am. 61, 740 (1971).

U. S. Whang, E. T. Arakawa and T. A. Callcott, Phys. Rev. B 5, 2118 (1972).

U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. B 6, 2109 (1972).

Calloway, J.

W. Y. Ching and J. Calloway, Phys. Rev. Lett. 30, 441 (1973).

Ching, W. Y.

W. Y. Ching and J. Calloway, Phys. Rev. Lett. 30, 441 (1973).

Crowell, J.

J. Crowell and R. H. Ritchie, J. Opt. Soc. Am. 6, 794 (1970); also see J. M. Elson and R. H. Ritchie, Phys. Rev. B 4, 4129 (1971).

Hamm, R. N.

U S. Whang, E. T. Arakawa, R. N. Hamm, and M. W. Williams, J. Opt. Soc. Am. 63, 305 (1973).

R. N. Hamm, R. A. MacRae, and E. T. Arakawa, J. Opt. Soc. Am. 55, 1460 (1965).

Hodgson, J. N.

J. N. Hodgson, in Optical Properties and Electronic Structure of Metals and Alloys, edited by F. Abelès (North–Holland, Amsterdam, 1966), p. 60.

Hunter, W. R.

W. R. Hunter, J. Opt. Soc. Am. 54, 15 (1964); J. Opt. Soc. Am. 55, 1197 (1965).

Kunz, C.

C. Kunz, Z. Phys. 196, 311 (1966).

Macek, C.

C. Macek, A. Otto, and W. Steinmann, Phys. Stat. Sol. 51, K59 (1972).

MacRae, R. A.

R. N. Hamm, R. A. MacRae, and E. T. Arakawa, J. Opt. Soc. Am. 55, 1460 (1965).

Otto, A.

A. Otto, Z. Phys. 216, 398 (1968); Phys. Stat. Sol. 42, K37 (1970); also see E. Kretschmann. Z. Phys. 241, 313 (1971).

C. Macek, A. Otto, and W. Steinmann, Phys. Stat. Sol. 51, K59 (1972).

Rasigni, Georges

Monique Rasigni and Georges Rasigni, J. Opt. Soc. Am. 62, 1033 (1972); J. Opt. Soc. Am. 63, 775 (1973).

Rasigni, Monique

Monique Rasigni and Georges Rasigni, J. Opt. Soc. Am. 62, 1033 (1972); J. Opt. Soc. Am. 63, 775 (1973).

Ritchie, R. H.

J. Crowell and R. H. Ritchie, J. Opt. Soc. Am. 6, 794 (1970); also see J. M. Elson and R. H. Ritchie, Phys. Rev. B 4, 4129 (1971).

Steinmann, W.

C. Macek, A. Otto, and W. Steinmann, Phys. Stat. Sol. 51, K59 (1972).

Sutherland, J. C.

J. C. Sutherland and E. T. Arakawa, J. Opt. Soc. Am. 57, 645 (1967); J. Opt. Soc. Am. 53, 1080 (1968); J. C. Sutherland, R. N. Hamm, and E. T. Arakawa, J. Opt. Soc. Am. 59, 1581 (1969).R. N. Hamm, and E. T. Arakawa, J. Opt. Soc. Am. 59,1581 (1969).

Whang, U S.

U S. Whang, E. T. Arakawa, R. N. Hamm, and M. W. Williams, J. Opt. Soc. Am. 63, 305 (1973).

Whang, U. S.

U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. Lett. 25, 646 (1970); J. Opt. Soc. Am. 61, 740 (1971).

U. S. Whang, E. T. Arakawa and T. A. Callcott, Phys. Rev. B 5, 2118 (1972).

U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. B 6, 2109 (1972).

Williams, M. W.

U S. Whang, E. T. Arakawa, R. N. Hamm, and M. W. Williams, J. Opt. Soc. Am. 63, 305 (1973).

Other

J. C. Sutherland and E. T. Arakawa, J. Opt. Soc. Am. 57, 645 (1967); J. Opt. Soc. Am. 53, 1080 (1968); J. C. Sutherland, R. N. Hamm, and E. T. Arakawa, J. Opt. Soc. Am. 59, 1581 (1969).R. N. Hamm, and E. T. Arakawa, J. Opt. Soc. Am. 59,1581 (1969).

U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. B 6, 2109 (1972).

U. S. Whang, E. T. Arakawa and T. A. Callcott, Phys. Rev. B 5, 2118 (1972).

U. S. Whang, E. T. Arakawa, and T. A. Callcott, Phys. Rev. Lett. 25, 646 (1970); J. Opt. Soc. Am. 61, 740 (1971).

Monique Rasigni and Georges Rasigni, J. Opt. Soc. Am. 62, 1033 (1972); J. Opt. Soc. Am. 63, 775 (1973).

W. Y. Ching and J. Calloway, Phys. Rev. Lett. 30, 441 (1973).

R. N. Hamm, R. A. MacRae, and E. T. Arakawa, J. Opt. Soc. Am. 55, 1460 (1965).

W. R. Hunter, J. Opt. Soc. Am. 54, 15 (1964); J. Opt. Soc. Am. 55, 1197 (1965).

A. Otto, Z. Phys. 216, 398 (1968); Phys. Stat. Sol. 42, K37 (1970); also see E. Kretschmann. Z. Phys. 241, 313 (1971).

U S. Whang, E. T. Arakawa, R. N. Hamm, and M. W. Williams, J. Opt. Soc. Am. 63, 305 (1973).

J. Crowell and R. H. Ritchie, J. Opt. Soc. Am. 6, 794 (1970); also see J. M. Elson and R. H. Ritchie, Phys. Rev. B 4, 4129 (1971).

C. Macek, A. Otto, and W. Steinmann, Phys. Stat. Sol. 51, K59 (1972).

A. J. Braundmeier and E. T. Arakawa, J. Phys. Chem. Solids 35, 517 (1974).

J. Bösenberg, Phys. Lett. 41A, 185 (1972).

J. N. Hodgson, in Optical Properties and Electronic Structure of Metals and Alloys, edited by F. Abelès (North–Holland, Amsterdam, 1966), p. 60.

C. Kunz, Z. Phys. 196, 311 (1966).

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