I have been Using N2O2 as in Nitrox, just a blended air mixture (28%-36%) for recreational diving. Longer bottom times at relatively shallow depths with shorter surface intervals for repetitive dives. I use to Dive a lot, 3-5 days a week.
Not implying anything Ionic or molecular or liquid. I'm not a Chemical guru but my understanding is that NO2 is Nitrogen Dioxide and I think N2O2 would actually be Dinitrogen Dioxide. Honestly I don't even know what the correct molecular formula for Nitrox is, NxOx? but whats in a name?
I don't have a trail name yet and I have been using n2o2diver for almost 10yrs.