## cage effect

https://doi.org/10.1351/goldbook.C00771
When in a condensed phase, or in a dense gas, @R05163@ molecules come together, or species are formed in proximity to one another, and are caged in by surrounding molecules, they may undergo a set of collisions known as an @E02086@; the term '@C00769@ effect' is then applied.
The @C00769@ effect is also known as the Franck–Rabinowitch effect.