Completely off topic, my apologies...
There's no such thing as O, unless you're talking about a free radical which would be O dot. Oxygen is diatomic meaning it's always O2 and so is hydrogen, H2.
I think the welding aspect of HHO's amazingness comes from the monatomic state of Hydrogen and Oxygen. mainly just the hydrogen. Monatomic Hydrogen turns into a neutron if is expands. Well, it's neucleous does, the electron just goes awol.
HHO probably has plasmonic qualities, but I'm sure it is a mixture and not a compound as is suggested rather often. Hydrogen doesn't stay monatomic, not even in natural gas reserves. It is very unstable when it's monatomic. A little heat and it's a neutron.
But agreed, in all naturally observe states it is diatomic.
Ps. on free radicals... O- is a free radical. Because it has a valence of 7, and thus strips hydrogen from peptides. this is bad for the body. But we need junk removed from the body. So do we drink chlorine? no. we use valence 6 elements, ie Sulphur, Oxygen. I am terrified by the ignorance generated by calling Oxygen a free radical. We've been breathing for 3 Billion years, if it was bad for us, well, we wouldn't be here. O2 in the air, O1 in the blood.
We put Chlorine and flouride in our water system. Halogens!!
Why do we do it? Because it's done. It is prudent, but so were lead water pipes in Roman times. Observe the creation of the Hydroxyl Radical:
NaCl + H2O -> Na(+) + Cl(-) + H2O -> HCl + OH(-) + Na(+)
And that's just table salt...
But our bodies can handle a bit, and we need the sodium for pituitary and kidney function (and other stuff.. )
Anyway, just wanted to comment on how Halogens were the cause of non-fatal cell degradation and Free radical generation.
Valence 6 = Carbon grabber = Destroyer
Valence 7 = Hydrogen grabber = Damager
I'd rather have a dead cell than a damaged one, because it's easier to replace than repair in a body that make 300 million red blood cells a day.
Anyhow sorry again for the irrrelevance to our chosen topic.