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The absorption spectra of all the alkali halides except LiF and Lil, measured in the range 5.0 to 12.0 eV at 10°K, are presented. These data complement earlier measurements made at 80°K. Identification of exciton lines involving d-like electrons is made by a comparison of the crystal absorption and the absorption spectra of rare-gas atoms. From the positions of exciton states with d-like electrons, the energy of the second conduction band at T is deduced for some of the alkali halides. The results of these deductions are compared with recent calculations of the conduction-band structure of KI and KC1.

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