Experimental Study of the Shape of the F Band Absorption in NaCl

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Abstract
The possibility of extending the authors' study of the optical absorption band associated with F centers in KCl to KI, KBr, and NaCl is explored. Due to the relative sizes and positions of the K and F bands in KI and KBr, one cannot resolve the two. The situation in NaCl is unclear; hence, a detailed study has been made. A unique F center can be formed in this crystal by various techniques. The optical bleaching properties depend on the means of production. Smakula's equation applies to this center, and it seems to be Pekarian. Our ``best equation'' for the width at half‐height H (in ev), has the form H2=0.075 coth (105.5/θ) — 0.01; where θ is the temperature. This study supports the general theory [J. J. Markham, Revs. Modern Phys. 31, 956 (1959)] although all the experimental problems have not been resolved.

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