Design of Velocity Map Imaging Spectrometer Equipped with a Mass Gate Discriminating Particular Photofragments

Figure 4

TOF spectra of C₆₀ at ℎ𝜈=90 eV (top) and the relevant timing diagram (bottom). (a) The control experiment by applying apulsed voltage to the repeller (𝑉_𝑅=75  V); (b) and (c) the discrimination of all species in doubly-charged state and C₅₄₂₊, respectively, by the PEX mode. The retarding grid was biased to 80 V, and a 100-V pulsed voltage was applied to the mass gate.