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Measurements have been made of the F-center absorption band in KC1, KBr, KI, NaCl, and LiF in the range from 4°K to 300°K. Analysis of these data shows that the important ionic vibrational frequency influencing the F-center is considerably lower than that of the lattice, indicating that a configuration coordinate curve model may be the appropriate one to use, rather than the continuous dielectric model. Using the peak of the ^-center emission bands as determined by Botden, van Doom, and Haven, and the present absorption data, configuration coordinate curves are computed for the ground and excited state curves of F-centers in KG, KBr, KI, and NaCl. Using these curves, predictions of the emission bandwidths are found to be in agreement with experiment except for the case of KG. The low efficiency of F-center luminescence may be understood by applying the criterion for luminescence proposed by Dexter, Klick, and Russell to these configuration coordinate curves.

In searching for efficient methods to dispose of lime Sludge, an Illinois Company finally discovered a process that not only serves the disposal purpose but also aids the agricuitural Community.

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