On the Wikipedia page about two-dimensional IR spectroscopy it is said that 2D IR spectroscopy can be used to study the
molecular dynamics with femtosecond time resolution.
According to Wikipedia it
has for example been used successfully to study hydrogen bond forming and breaking and to determine the transition state geometry of a structural rearrangement in an iron carbonyl compound.
Now I'm curious. What equipment is necessary to perform 2D IR experiments? Does somebody have experience with 2D IR spectroscopy and could explain how the geometry of the system is inferred just from the (2D) IR spectrum.