Beamline

Energy calibration and evaluation of the resolving power of the monochromator were performed measuring photoabsorption spectra of well characterized gases (N₂ and Ar). The performance of the monochromator is illustrated by the data in Figure. The theoretical resolving power reported in the figure was calculated considering different contributions like exit slit dimension, coma aberration, diffraction limit, and measured grating slope error. Experimental measurements at two photon energy points for Ar (244eV) and N (400eV) edges show good quantitative agreement with theoretical values.