“…As both of these species are expected to be from the plasma region, either of them could be ionized. In case of the argon plasma photons, downstream ionization of
by the radiation is not possible (ionization potential 13.3 eV [
88 ] ), which explains the lower relative abundance of the ion at 171 amu when compared with the abundance with helium plasma photons. A similar explanation for the formation of the species at 100 and 101 amu as well as 200 amu is unfortunately not possible.…”