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The Optical F Absorption Band

Naturevolume 192pages12861287 (1961) | Download Citation



IN a recent communication1 a new model for the optical F absorption band was proposed for the alkali metal azides. From a study of irradiation-produced bands in the visible and infra-red region of the absorption spectrum of the azides, it was shown that the anion (N&3bar;) was intimately related to the F absorption band and it was suggested that the F band was caused by a ‘charge-transfer’ complex of the type discussed extensively in the chemical literature, especially by Mulliken2. The ‘charge-transfer’ complex consists of a dative bond being established between one electron donor and an electron acceptor with a concomitant electronic absorption belonging to the complex as a whole.

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  1. 1

    Papazian, H. A., J. Phys. Chem. Solids, 21, 81 (1961).

  2. 2

    Mulliken, R. S., J. Phys. Chem., 56, 801 (1952).

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    General reference, Seitz, F., Revs. Mod. Phys., 26, 7 (1954).

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    Glasner, A., and Tompkins, F. C., J. Chem. Phys., 21, 1817 (1953).

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    Mott, N. F., and Gurney, R. W., Electronic Processes in Ionic Crystals (Oxford Univ. Press, 1948).

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    Pauling, L., The Nature of the Chemical Bond, third ed. (Cornell Univ. Press, 1960).

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    Hacskoylo, M., and Otterson, D., J. Chem. Phys., 21, 555 (1953).

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    van Doorn, C. Z., and Haven, Y., Phys. Rev., 100, 753 (1955).

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  1. HAROLD A. PAPAZIAN: U.S. National Academy of Sciences—National Research Council Postdoctoral Fellow, on leave from the Convair Scientific Research Laboratory, San Diego, California.


  1. Department of Chemistry, Imperial College of Science and Technology, London, S.W.7



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