The X-ray K emission spectrum of sodium and of fluorine in some alkali halides

The integrated intensities of the K alpha emission satellite groups alpha alpha 3 alpha 4 and alpha 5 alpha 6 have been measured in secondary excitation for Na + in NaF, NaCl and NaBr and of F - in LiF, NaF and KF. The results are generally in agreement with calculations based on the assumption that the satellites are due to single-electron transitions for KL and KL 2 states of free ions. However, in LiF and KF the satellite intensities differ from the free ion values; this is attributed to the fact that in fluorides the F - L II,III electrons are valence electrons. The intensity and position of the Na + K beta 1 line have been determined for the various halides. The K beta 1 line has been identified as a cross transition between the cation and anion. Its appearance is solely determined by the covalency in the crystal.