# B Are OH molecules in masers ionized?

1. Jan 1, 2017

It seems like a very basic question. I've read about OH molecules in the context of astrophysical masers and perhaps it is already known, but the notation always omits the "-" superscript to denote the molecule as being an ionized one (i.e. an anion). Just to clarify, are OH molecules in masers such as those found in interstellar regions actually ionized?

2. Jan 1, 2017

3. Jan 2, 2017

### Ken G

And if you compare to the much shorter article on the hydroxyl ion, https://en.wikipedia.org/wiki/Hydroxyl_ion_absorption, you see the contexts are much more limited. It seems that you mostly only get the hydroxyl ion in solution, rather than in the ultra-low density molecular clouds you find in astronomy.