Abstract

The extinction coefficients, k, of sodium and potassium have been found by measuring the transmittance of vacuum-evaporated films 400–900 nm thick deposited on quartz or lithium fluoride substrates. Corrections were made for losses due to surface reflections, substrate absorption, and contamination of the exposed surface of the metal. Previously determined values of the refractive indices, n, of Na and K were used to compute the imaginary part, 2 = 2nk, of the dielectric constant. Above the interband energies, at 2–3 eV, 2 for both Na and K decreases rapidly with increasing photon energy up to the plasma energy. Beyond the plasma energy, 2 remains nearly constant within the limits of our measurements. The values of 2 for K are more than twice those for Na in the region above the plasma energy.

© 1969 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Optical Properties of Potassium for Photons of Energy 3.96 to 9.69 eV*

J. C. Sutherland and E. T. Arakawa
J. Opt. Soc. Am. 58(8) 1080-1083 (1968)

Optical Properties of Sodium in the Vacuum Ultraviolet*

J. C. Sutherland, E. T. Arakawa, and R. N. Hamm
J. Opt. Soc. Am. 57(5) 645-650 (1967)

Demonstration of partially transparent thick metallic sodium in the vacuum ultraviolet spectral range

Hiroyuki Daido, Yoji Suzuki, Tetsuya Kawachi, Takeshi Fukuda, Toshio Nakagiri, Masanori Kaku, and Shoichi Kubodera
Opt. Express 21(23) 28182-28188 (2013)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (3)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription