INVESTIGATION OF THE EFFECT OF COSTER-KRONIG TRANSITIONS AND INCIDENTPHOTON ENERGY ON AVERAGE L-SHELL FLUORESCENCE YIELDS

In order to investigate the dependence of average L shell fluorescence yields on incident photon energy and the role of Coster-Kronig transi tions therein, the values of average L shell fluorescence yields were calculated and experimentally determined in elements 40 less than or e qual to Z less than or equal to 92 for incident photons with energies lying just above the L(1) edge and just below the K edge energies of t he target element without and with Coster-Kronig transitions. In the a bsence of Coster-Kronig transitions the fluorescence yields are found to be strongly energy dependent but the extent of compensation provide d by the Coster-Kronig transitions at different incident photon energi es is adjusted in such a way as to make the average L shell fluorescen ce yields independent of the incident photon energies. Thus, the Coste r-Kronig transitions are seen to play a major role in making average L shell fluorescence yields independent of incident photon energy.