it's the deuterium hydroxonium ion.
you get it when you acidify deuteriated water.
not very cheap.
cheers!
dh2o is distilled water.
If you honestly didn't know this, you could've used Google or any dictionary or encylopedia. Or even read the sticky threads, which would've led you here:
http://www.chemfinder.com (http://www.chemfinder.com)
If these facts didn't occur to you, perhaps you should rethink involving yourself with matters such as the type discussed here.
(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000426710-file_jtjs.gif)
