Figure 3
Registered counts per second along the most intense region of the illuminated area (see inset for a logarithmic image of the spot shape; the white line indicates the cut line of the plotted profiles). The detector images were recorded at four different storage ring currents under otherwise identical conditions (Eph = 2.5 keV). Each profile has been scaled by the ratio of minimal ring current (6 µA) and the ring current of the profile. Deviations from a linear counting behaviour manifest in lower scaled count rate in comparison with the 6 µA profile. |