Measurements have been made on the quantum efficiency of luminescence from F centers in x-rayed LiF and additively colored KCl at 4^∘{}K. In the wavelength range from 3000A to 20 000A an upper limit of 3 percent efficiency is found for the LiF F-band emission, if it exists. At 25 000A the upper limit is 10 percent. Similar results are found for F centers in KCl in the wavelength range from 6500A to 25 000A. These results are in disagreement with theoretical predictions that the F center should luminesce with high efficiency in the wavelength region near 10 000A.
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Clifford C. Klick (1954) studied this question.
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