Correction of Self Absorption on XAS Measurements in Fluorescence Mode

Self absorption and influence of neighbouring absorption edges make it necessary to correct data of XAS measurements in fluorescence mode. To simulate the fluorescence process and to calculate the absorption coefficients from experimental data, informations about stoichiometric composition and fluoresnee yields are needed. Some examples show the necessity of correction of fluorescence spectra to get true absorption coefficients and the advantage of the method: In ZnSe the Se absorption coefficient can be calculated from the Zn L absorption spectrum. In the same system the intensity breakdown of Zn L fluorescence absorption spectra due to Se absorption above the Se L-edges can be removed.