Time-resolved FTIR spectroscopy (TRS) is widely used e.g. to track the kinetics of single shot chemical reactions via Rapid-Scan or repeatable kinetics via the StepScan technique. Although both techniques provide outstanding application opportunities they also imply inherent limitations.
The step-scan technique allows the monitoring of the temporal progress of very fast reproducible events (transients) down to the very low ns-range. The interferometer mirror consecutively steps to the separate interferogram points one by one where the experiment is restarted again. Temporal resolution up to 2,5 nsec is possible.
For time-resolved spectroscopy of non-reproducible experiments, data can be obtained using the so-called Rapid-Scan technique. In this case the interferometer mirror moves very fast and up to 4 spectra can be extracted from each full forward-backward interferometer scan. Up to 110 spectra acquisition per second possible.
The interleaved time-resolved (TRS) acquisition mode for VERTEX series spectrometers is a powerful approach for time-resolved measurements of a certain class of repetitive experiments with extraordinary signal to noise ratio. The interferometer mirror is moving continuously and the zero-crossings of the internal HeNe laser are used to trigger the experiment
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