FLUORESCENCE YIELD DETECTION - WHY IT DOES NOT MEASURE THE X-RAY-ABSORPTION CROSS-SECTION

It is shown that fluorescence yield (FY) detection does not measure a pure X-ray absorption spectrum if multiplet effects are important. The reason is that while the Auger decay is approximately constant, the f luorescence decay shows a strong dependence on the final state. With a coherent description of the X-ray absorbtion and X-ray emission proce sses, the observed differences between TEY and FY detected nickel 2p e dges can be reproduced accurately. In the, approximate, incoherent des cription the FY spectral shape identifies with the X-ray absorption sp ectrum multiplied with its state dependent fluorescence decay. Self-ab sorption effects are calculated and the implications for X-ray Magneti c Circular Dichroism (X-MCD) and generalisations to other systems are discussed.