I have a question about the stability of Peroxynitric Acid i.e. $\ce{HO2NO2}$ at cold temperature. I know that it becomes stable when temperature decreases, but what is the specific reason for it? I guess it has to do with the temperature changing the potential hypersurface, but I'm not sure. I also seem to not be able to find a good explanation about it in the internet, since most is about the kinetics I'm not interested in. Possibly, this question relates to all PAN-like species i.e. $\ce{R(O)OONO2}$ such as the acetylperoxy nitrate. Any good physical explanation? Thanks

  • $\begingroup$ High entropy of decomposition, I guess. $\endgroup$ – Mithoron May 18 '20 at 17:35
  • $\begingroup$ Can you elaborate a bit more? $\endgroup$ – Diger May 18 '20 at 18:42

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