The effective attenuation length EAL is a

As an example, results obtained for the Au 4f7/2 photoelectrons PP242 shown in Fig. 14. Furthermore, let us average the percentage deviations over the range of emission angles from α = 0° to α = 50°, i.e. the range in which the signal intensities are practically constantequation(20)<ΔI>=1m50∑i=1m50ΔI
Fig. 14. Emission angle dependences of percentage differences between signal intensities of Si 2s1/2 photoelectrons calculated from Eqs. (19a)–(19c). Squares: percentage differences, ΔIDA−NDA1; diamonds: percentage differences, ΔIDA−NDA2; triangles: percentage differences, ΔINDA1−NDA2. (a) Photoelectron kinetic energy equal to 1 keV; (b) 3 keV; (c) 5 keV; and (d) 10 keV.Figure optionsDownload full-size imageDownload as PowerPoint slide
where m50 is the number of emission angles not exceeding 50°. The average percentage deviations are listed in Table 1. We note that the percentage differences between intensities resulting from the NDA1 and NDA2 cross sections are below about 2% at kinetic energies up to 5 keV. Slightly larger differences, close to 5%, are observed for energy of 10 keV. The percentage differences ΔIDA−NDA1 and ΔIDA−NDA2 increase from about 5% at energy 1 keV to 40% or more at 10 keV.