Hmmm...
I would have thought that the formation went H2 + H+ -> H3+
Basically, you take H2, slam a loose proton (positive hydrogen ion) into it, and you've got your H3+, no need for emitted electrons.
I would have thought that the formation went H2 + H+ -> H3+
Basically, you take H2, slam a loose proton (positive hydrogen ion) into it, and you've got your H3+, no need for emitted electrons.