Position, Energy, and Transit Time Distributions in a Hemispherical Deflector Analyzer with Position Sensitive Detector

Figure 3

The time-of-flight and the exit radius are plotted as a function of launching angle , for pass energy keV and for a point source (), in both ideal and fringing field HDAs. In (d), the conventional (mm) fringing field HDA (black squares) is seen to have a much larger and asymmetric spread in as a function of , far from 1st-order focusing conditions. The two paracentric entries (mm and  mm), however, have much narrower spreads in demonstrating full 1st-order focusing and therefore much improved energy resolution. The analytical solutions valid for the ideal field HDA in (a) and (b) were obtained using (14) for and (28) for .

(a)

(b)

(c)

(d)