The relative fluorescent quantum efficiency of sodium salicylate was measured between 90 and 800 eV (138–15 Å) by the use of synchrotron radiation. A general increase in efficiency was observed in this spectral range except for abrupt decreases in efficiency at the carbon and oxygen K-edges. Beyond the oxygen K-edge (532 eV) the efficiency increased linearly with the incident photon energy to the limit of the present observations.
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Angel et al. (1986) studied this question.
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