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CsI has been selected as the photocathode material in order to enhance the bare MCP quantum efficiency by about a factor of three in the ROSAT energy range (0.1 to 2.4 keV). The quantum efficiency was measured at a set of discrete energies and at the average angle of incidence for the ROSAT X-ray optics. These data are shown plotted in Figure 4.10 and listed in Table 4.4 . The features in the plot are based on fitting the measured data points and the major dip around 0.6 keV is due to absorption edges in both Cs and I near this energy.
|Energy (keV)||quantum efficiency|