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Time-Resolved FT-IR Absorption Spectroscopy Using a Step-Scan Interferometer

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Abstract:

The implementation of time-resolved step-scan FT-IR spectroscopy with a commercial interferometer is described. With the use of the photoreaction of the biological system bacteriorhodopsin as an example which exhibits infrared spectral changes smaller than 10−2 absorbance units, the quality of the method is demonstrated. A comparison with conventional flash-photolysis experiments with a monochromatic infrared monitoring beam clearly demonstrates the multiplex advantage. The advantage of covering the total time course of the reaction allows for a variety of data analysis, such as forming difference spectra between intermediates of the reaction and the deduction of time courses of absorbance changes at selected wavenumbers. The mirror stability is better than ±1.5 nm, which is sufficient for the reliable measurement of small absorbance changes.

Keywords: Bacteriorhodopsin; Biochemical systems; Step-scan Fourier transform Spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702914337128

Affiliations: 1: Institut für Biophysik und Strahlenbiologie der Albert-Ludwigs-Universität, Albertstrasse 23, D-7800 Freiburg, F.R.G. 2: Institut für Biophysik und Strahlenbiologie der Albert-Ludwigs-Universität, Albertstrasse 23, D-7800 Freiburg, F.R.G.; Max-Planck-Institut für Biophysik, Kennedyallee 70, D-6000 Frankfurt a.M. 70, F.R.G.

Publication date: March 1, 1991

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