While the high-pressure behavior of most pure molecules is established under high-pressure conditions, this is not true for mixtures and significant knowledge gaps remain, even for binary systems. At only a few kbar above atmospheric pressure, entirely new molecular compounds are found in simple systems like H2 and H2O. Many of these materials are dense with molecular hydrogen and could serve as useful energy storage materials. These type of compounds may also be important to planetary science with abundance on certain planetary bodies.
Fundamental interactions in molecular systems are often very interesting. Inelastic scattering methods, such as neutron and light scattering techniques, are extremely useful tools to probe these interaction in situ.