Fourier Transform spectrophotometry

It is essential to use pure samples for infra-red spectrophotometry. The main difficulty is that of purifying and handling a few micrograms of material without substantial losses, although these problems have largely been overcome by linking gas or liquid chromatography with Fourier transform spectrophotometry. 

Always based on the use of IR spectrophotometry, a novel attenuated total reflection-Fourier-transform infrared (ATR-FTIR) sensor [42] was proposed for the on-line monitoring of a dechlorination process. Organohalogenated compounds such as trichloroethylene (TCE), tetrachloroethylene (PCE) and carbon tetrachloride (CT) were detected with a limit of a few milligrams per litre, after extraction on the ATR internal-reflection element coated with a hydro-phobic polymer. As for all IR techniques, partial least squares (PLS) calibration models are needed. As previously, this system is promising for bioprocess control and optimization. 

FTNIR (Fourier transform near-infrared spectrophotometry), 663 FuUerene adducts, regioselective... 

Mirabella, F. M., Jr. (1987) Applications of microscopic Fourier transform infrared spectrophotometry sampling techniques for the analysis of polymer systems. In The Design, Sample Handling and Applications of Infrared Microscopes (P. B. Rousch, ed.), American Society for Testing and Materials, Philadelphia, PA, pp. 74—83. 

Absorption spectrophotometry (UV-Vis) Fourier transform infrared, resonance Raman and fluorescence spectroscopy X-ray diffraction... 

The apparatus consists of an interferometer using Fourier transform infra-red spectrophotometry covering the range 2000-10000 nm which corresponds to part of the mid infra-red range of the electromagnetic spectrum. After calibrating the instrument for different organic compounds, spectral analysis of the data enables the simultaneous determination of several analytes in must or wine. 

Measurement of the Oxygen and Carbon Content of Silicon Wafers by Fourier Transform IR Spectrophotometry... 

Fourier transform infrared spectrophotometry is used widely in the semiconductor industry for the routine determination of the interstitial oxygen content of production silicon wafers. However, the lack of interlaboratory reproducibility in this method has forced the use of ad-hoc calibration methods. The sources of this lack of reproducibility are just beginning to be understood. As investigation of this problem continues and wider acceptance is gained for improved experimental and analytical techniques, a greater degree of reproducibility should be achieved. Furthermore, new standard test methods and standard reference materials being developed by the ASTM (71 ),... 

Cordon, B.M., W.M. Coleman III, J.F. Elder Jr, J.A. Ciles, D.S. Moore, C.E. Rix, M.S. Uhrig, and E.L. White Analysis of flue-cured tobacco essential oil using multidimensional gas chromatography mass spectrometry and matrix isolation Fourier transform infrared spectrophotometry 41st Tobacco Chemists Research Conference, Program Booklet and Abstracts, Vol. 41, Paper No. 7, 1987, p. 15. 

Infrared spectrophotometry is a familiar established analytical technique which provides identification of compounds by fingerprint spectra, of which a vast library is available. Both liquid and gaseous samples may be easily analysed and therefore modifications of established sample handling techniques have enabled both GC and HPLC instruments to be readily interfaced. Ideally, scan times of less than 1 s are required to be able to record each peak and peak shoulders. Instrument sensitivity is sufficient so that on the fly recording of spectra can be obtained from GC and HPLC eluants which contain nanograms of sample per ml mobile phase, for example, 10 ng sample in 100 pi GC-IR sample cell. Fourier transform infrared (FTIR) instruments are able to meet these criteria but until recently the instrumentation and computer system have been too expensive for routine use. The new generation of... 

Chemical analysis of hazardous substances in air, water, soil, sediment, or solid waste can best be performed by instrumental techniques involving gas chromatography (GC), high-performance liquid chromatography (HPLC), GC/mass spectrometry (MS), Fourier transform infrared spectroscopy (FTIR), and atomic absorption spectrophotometry (AA) (for the metals). GC techniques using a flame ionization detector (FID) or electron-capture detector (BCD) are widely used. Other detectors can be used for specific analyses. However, for unknown substances, identification by GC is extremely difficult. The number of pollutants listed by the U.S. Environmental Protection Agency (EPA) are only in the hundreds — in comparison with the thousands of harmful... 

DSC and Fourier-transform infrared spectrophotometry (FTIR) are used to detect possible changes in the physical-chemical properties of the active ingredient and/or carrier, and possible interactions between the components used in the formulations, respectively. 

Fourier Transform Infrared Spectrophotometry. Thin films of the polymers were prepared from 5% by weight solutions of the polymers in methylene chloride via a doctor blade. A Nicolet Magna-FTIR Spectrometer 550 was used to record the transmission spectra of thin films. 

Fourier transform infrared spectrophotometry (FTIR) spectra of the neutral pol5mier PEDOT indicates a regular structure formed via a-a coupling of thiophene rings. The polymer shows two absorption bands at 341 nm and 413-419 nm in an N-methyl-2-p5n-rolidone (NMP) solution in the ultraviolet-visible (UV-Vis) luminescence with peak at ca. 552 nm. 

---