The extension of a continuous scan high spectral resolution(0.006 cm−1)Fourier transform spectrometer for time-resolved Fourier transform spectroscopy with a temporal resolution in the ns regime is described. The time resolution is achieved by synchronizing a laser/transient digitizer system with the interferometer. The realization of the data acquisition and the experimental setup are described. Examples of time-resolved measurements are given. Detector limited temporal resolution of<10 nsis shown by recording scattered light from a pulsed dye laser. Spectral resolution of<0.5 cm−1is demonstrated by observing the fluorescence of electronically excited CH radicals produced in the multi photon dissociation ofCHBr3.The signal-to-noise behavior of time-resolved Fourier transform apparatus is investigated as a function of spectral (0.1–4.0 cm−1unapodized) and time resolution and of the intensity of the detected light. ©1998 American Institute of Physics.