Knowledge Bank

We have compiled the literature data about the vibrational bands of all species fitting the $Hx$$Ny$$Oz$ chemical formula. The various information published in the far-, mid- and near-infrared ranges was taken into account with appropriate comments, for all possible phases, solid matrix or gas ones. We have at the same time updated the results concerning $N2$$O4$ on the basis of spectra recorded at medium resolution and under various temperature conditions. The tables will be introduced, with specific emphasis on that latter species.""