I'm dealing with a common photoresist developer TMAH (tetramethylammonium hydroxide) and attempting to design a vapor sensor for a sealed chamber. Now I havent been able to confirm what exactly is evaporating from the solution causing it to smell. I assumed that tetramethylammonium hydroxide would equilibrate with trimethylamine and methanol, and the liberated non-ionized species would evaporate before shifting back into their respective ions.
My question is whether those species as individual molecules would evaporate, or do droplets of the ionized solution evaporate together? And if droplets of water/TMAH solution evaporate, would water absorb energy, throwing off the reading made by a photoionization detector?