Abstract
AbstractWe have studied the absorption and luminescence spectra of color centers in a LiF crystal surface thin layer which are produced by low energy electrons from a secondary electron emission microwave discharge. The intensityratio of the absorption band due to the F2 color center to the band due to the F center was observed to be much higher than the ratio of these color centers produced in the whole bulk crystal. It was found that the F−2 center is produced in a thin layer through a selective two‐step photoionization of F2 color center by irradiation with the 514.5 nm Ar+ laser line. A mechanism of colorcenter formation in the thin layer is discussed.
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