Time resolved FTIR Fourier transform

The chapter is set out in the following way. Section II contains elements of the theory of Fourier transformations which, rather than being exhaustive (and exhausting), aims to cover the details and limitations of the technique which are of importance for the experimentalist to understand. Section III contains descriptions and comparisons of the SS and CS methods and outlines the advantages and pitfalls of each, together with recommendations for their suitability for specific applications. Section IV presents recent results from time-resolved FTIR emission experiments, emphasizing photochemical applications. 

Capillary columns are used to separate 1,1,1-trichloroethane from the other components in a mixture. Capillary columns provide wider versatility offering superior resolution of components. A comparison of capillary and packed column for analysis of volatile organics by GC is available (Clark and Zalikowski 1990). Narrow-bore capillary columns have high resolving power but may not be suitable for headspace analysis because of easy column saturation (Ohno and Aoyama 1991). Wide-bore capillary columns are suitable in such cases (Ohno and Aoyama 1991). Different detectors can be used ECD, HECD, and MS have been described. The MS is the most selective detector, but the HECD is the most sensitive. Both closed path and open path Fourier transform infrared spectrometry (FTIR) have recently been used for the determination of 1,1,1 -trichloroethane in air (Carter et al. 1992 Trocha and Samimi 1993 Xiao and Levine 1993). Although the FTIR methods have higher detection limits than some of the other conventional methods, they afford the opportunity of remote monitoring of real-time samples (Xiao and Levine 1993). 

Figure 3.13. (d) Time-resolved attenuated total reflectance (ATR) Fourier transform infrared (FTIR) spectra collected during arsenic (As) oxidation on random stacked bimessite (RSB). Peaks represent the oxidation product, arsenate, adsorbed at the RSB surface. (Z ) As oxidation kinetic data collected on RSB (O) on hexagonal bimessite (H-Bi) ( ) during a batch experiment. Inset shows the peak height versus time plot for the spectra seen in the top panel, illustrating the higher time resolution achievable with rapid-scan ATR-FUR spectroscopy. (From Borda and Sparks, unpublished data, 2006.)... 

Fourier Transform Infrared Spectroscopy (FTIR) is often used in high-pressure cells to obtain time-resolved absorption bands evolving during the course of the reaction. The spectral information is recorded in the time domain as an interfer-... 

Friedrich Kremer is Professor of Molecular Physics, Materials Research Spectroscopy, Institute of Experimental Physics I, University of Leipzig, Germany. His research interests include broadband dielectric spectroscopy, time-resolved Fourier transform infrared (FTIR) spectroscopy, and experiments with optical tweezers. In 2005 he was awarded with the Karl Heinz Beckurts - Prize in 2011 he received the Wolfgang-Ostwald-Prize from the German Colloid Society. 

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