Intermediate X-ray Sources for ESCA

The applicability of the YM? (hv = 132 eV) and the FK? (hv = 676 eV) X-ray lines for generating photoelectron spectra is demonstrated. The N2 valence electron spectra excited by YM? and A1K? are studied in regard to relative intensities and shake-up structure. Relative intensities of electron levels in Au excited by FK? and A1K? are measured. Cross-section ratios for FK? and A1K? excited spin-orbit components in Ar and Au are determined. Experimental and theoretical cross-section ratios of the Hg 5d spin-orbit components are reviewed for excitation energies between 21 eV and 2 700 eV.