In addition to detecting chemical ionization during an electrochemical reaction, the same phenomenon was also found in an inert gas atmosphere without a reaction being conducted. In a new experiment, a different carrier gas was used (Ar vs. CO) and the H2 was brought in directly rather than derived from electrolysis. Figure compares the mass spectra when H2O was saturated with pure Ar versus saturated with 5% H2 mixed in Ar. Similar to the CO atmosphere, M2 and M3 both increased in H2-mixed Ar compared to pure Ar. IM40-Ar showed negligible change in both gas atmospheres. However, there was a substantial increase in M41(exhibited as a wide peak in the inset in Figure ), which can be attributed to [Ar+H]+, formed through the proton transfer mechanism, where H2 functioned as the reagent gas and Ar as the analyte (A). M41 peak being wide is a result of applying both a reduced EI energy as well as the secondary electron multiplier, which might lead to a worse m/z resolution, but will not influence the argument in this work in any way.