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.

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    $\begingroup$ As I understand, you have one broadband light source to do simple (non-FT) absorption spectroscopy, and another one to excite the system beforehand. Now you vary the time distance between excitation & measurement, and FT every point in the measured spectra along that development time axis. $\endgroup$
    – Karl
    Oct 22, 2016 at 11:46

1 Answer 1


You can find a schematic drawing of the box-CARS 2D IR setup in the publication Enhancing signal detection and completely eliminating scattering using quasi-phase-cycling in 2D IR experiments, Robbert Bloem, Sean Garrett-Roe, Halina Strzalka, Peter Hamm, Paul Donaldson


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    $\begingroup$ Usually, we would prefer the answer doesn't boil down to just giving a link. Can you summarize some key points from the paper or maybe include the image in this answer? $\endgroup$
    – Tyberius
    Mar 10, 2018 at 23:53

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