Time-Resolved FTIR Spectroscopy Using a Step-Scan Interferometer

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Abstract
In contrast to resonance Raman spectroscopy, there are only few reports on time resolved infrared spectroscopy (1-7). There are two main reasons: 1. infrared detectors have, as compared to UV-vis detectors, a low detectivity; 2. efficient broad-band infrared sources have usually low power. Earlier, we have developed an apparatus for infrared flash-photolysis experiments using a commercial infrared spectrophotometer as tunable monochromatic source and a photocon-ductive HgCdTe-detector. With this equipment, we were able to obtain time-resolved infrared difference spectra of CO-myoglobin (1,9), rhodopsin (10,11) and bacteriorhodopsin (11). The time-resolution could be increased up to 0.5 μs (12). But the mentioned disadvantages caused total measuring times of one day or longer. The low power of infrared sources can how be overcome by the use of quasi-continuously tunable laser sources such as CO-lasers (3) and lead-salt diode lasers (8).

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