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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 64, Iss. 6 — Jun. 1, 1974
  • pp: 839–845

Ultraviolet optical properties of Li

T. A. Callcott and E. T. Arakawa  »View Author Affiliations


JOSA, Vol. 64, Issue 6, pp. 839-845 (1974)
http://dx.doi.org/10.1364/JOSA.64.000839


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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 n and k for each energy. Above 6 eV, measurements with photons incident on both vacuum and substrate surfaces gave the same values of n and k within experimental limits of about ±5%. Below 6 eV, values of n and k 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 R (θ) curves, which are not accounted for in Fresnel’s equations. These effects are believed to be small above 6 eV. The dielectric function ε1, and ε2 and the energy-loss function Im(-1/ε) were determined from n and k for photon energies above 6 eV. The plasma energy of Li, as determined from the condition ε1 (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 ε2 in the spectral region above the plasma frequency.

Citation
T. A. Callcott and E. T. Arakawa, "Ultraviolet optical properties of Li," J. Opt. Soc. Am. 64, 839-845 (1974)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-64-6-839

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