For decades, infrared (IR) spectroscopy has been a valuable tool to elucidate the static structure of molecules – in the gas phase, in liquid solution, or in solid matrices. When carried out with pulsed electric fields, it gives direct access to the dynamic evolution of the structure of molecules, either at thermal equilibrium or in response to an external stimulus, e.g. a photonic excitation.[1-5] Time-resolved IR-spectroscopy can be conducted in distinct modes of operation thereby giving