Fig. 5.

Scaling of cross-sections and information vs energy. The theoretical relationship between the elastic (σ_e) and inelastic (σ_i) scattering cross-sections for carbon are plotted vs. energy. The regions experimentally verified in this work are highlighted with solid lines, with extrapolations in dotted lines. Purple curves are the information coefficient plotted vs energy on the right axis for a 100, 300 and 1000 Å thick specimen. Inset is a plot of the positions of the maxima of the information coefficient vs. thickness, again with the experimental region in solid line. The curve levels off past the minimum in σ_i (minimum ionising particle) as the inelastic cross-section increases at high energy.