Figure 3: Dissociative photoelectron capture on nanoparticles of zinc oxide under different bias voltages.

Mass spectra of juglone were acquired in the negative ion mode under different bias voltages. (a) 20 V. (b) 30 V. (c) 60 V. (d) Overall intensity trend of the negative ion at m/z 174 Da and (e) 173 Da under different bias voltages.