What does XFY stand for?
XFY stands for X-ray fluorescence yield
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It competes with the Auger effect, which results in emission of a second photoelectron to regain stability. The relative numbers of excited atoms that fluoresce are described by the fluorescence yield.
4. 2. 1 X-ray absorption edges, characteristic X-ray lines and fluorescence yields For a given absorbing element, the general fall in X-ray absorption coefficient with increasing energy of incident photon is interrupted by a sharp rise when the energy is equal to the binding energy of an electron shell (K, L, M, etc. ) in the absorber; this energy is the least at which a vacancy can be created in the particular shell and is referred to as the edge or critical excitation energy.