Abstract

Photons of energy <i>h</i>ν>3.5 ev eject external photoelectrons from the valence bands of the semiconductors Cs<sub>2</sub>Te and Rb<sub>2</sub>Te with a quantum efficiency as high as 30 percent. Fundamental optical absorption sets in roughly at this same point. These materials are similar to Cs<sub>3</sub>Sb, except that they have forbidden energy zones almost twice as wide. Consistent with this, energy distributions show no evidence for electron-electron scattering up to <i>h</i>ν = 6.7 ev. These hv substances are interesting for ultraviolet photometry.

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  1. Gmellins Handbuch der Anorganischen Chemie (Verlag Chemie, Berlin, 1938), 8th Ed., System No. 25, Caesium, p. 230.
  2. Apker, Taft, and Dickey, J. Opt. Soc. Am. 43 (1953).
  3. L. Apker and E. Taft, Phys. Rev. 81, 698 (1951) and references cited there.
  4. It is difficult to keep the initial Te surface entirely free of contamination by Cs in this type of tube; nevertheless, the results are in reasonable agreement with previous work—see Apker, Taft, and Dickey, Phys. Rev. 74, 1462 (1948).
  5. J. A. Burton, Phys. Rev. 72, 531(A) (1947) ; see also reference 2.
  6. J. de Boer, Electron Emission and Absorption Phenomena (Macmillan Company, New York, 1935).
  7. See reference 2, footnote 3; structure in the yield curve for Cs3Sb is so close to the fundamental threshold that it is difficult to separate.
  8. In favorable cases, we have observed yields as high as 5 percent for exciton-induced emission from F centers in RbI, where the bottom of the conduction band probably lies about I ev below the vacuum. See Phys. Rev. 82, 814 (1951) and papers cited there.
  9. W. Kluge, Z. Physik 67, 497 (1931).

Apker, L.

L. Apker and E. Taft, Phys. Rev. 81, 698 (1951) and references cited there.

Burton, J. A.

J. A. Burton, Phys. Rev. 72, 531(A) (1947) ; see also reference 2.

de Boer, J.

J. de Boer, Electron Emission and Absorption Phenomena (Macmillan Company, New York, 1935).

Kluge, W.

W. Kluge, Z. Physik 67, 497 (1931).

Taft, E.

L. Apker and E. Taft, Phys. Rev. 81, 698 (1951) and references cited there.

Other (9)

Gmellins Handbuch der Anorganischen Chemie (Verlag Chemie, Berlin, 1938), 8th Ed., System No. 25, Caesium, p. 230.

Apker, Taft, and Dickey, J. Opt. Soc. Am. 43 (1953).

L. Apker and E. Taft, Phys. Rev. 81, 698 (1951) and references cited there.

It is difficult to keep the initial Te surface entirely free of contamination by Cs in this type of tube; nevertheless, the results are in reasonable agreement with previous work—see Apker, Taft, and Dickey, Phys. Rev. 74, 1462 (1948).

J. A. Burton, Phys. Rev. 72, 531(A) (1947) ; see also reference 2.

J. de Boer, Electron Emission and Absorption Phenomena (Macmillan Company, New York, 1935).

See reference 2, footnote 3; structure in the yield curve for Cs3Sb is so close to the fundamental threshold that it is difficult to separate.

In favorable cases, we have observed yields as high as 5 percent for exciton-induced emission from F centers in RbI, where the bottom of the conduction band probably lies about I ev below the vacuum. See Phys. Rev. 82, 814 (1951) and papers cited there.

W. Kluge, Z. Physik 67, 497 (1931).

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