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If no one else is using the instrument next, please turn off the nitrogen purge. PRINCIPLES OF IR SPECTROSCOPY. The different regions of the electromagnetic 3. T H E O R Y. O F F T - I R. Why Infrared Spectroscopy? Infrared spectroscopy has been a workhorse technique for materials analysis in the laboratory for over. The principle behind Fourier Transforms is that any wave (or periodic function) can be expressed as a sum of cosine and sine functions (a Fourier Series). Page 12 In FTIR analyses, Infrared light from the light source passes through a Michelson interferometer along the optical path. The Michelson interferometer comprises a beam splitter, moving mirror, and fixed mirror. The light beams are recombined in the Michelson interferometer to produce interference light. FTIR_Instrumentation_short.pdf, RL 2008. FTIR Two types of instrumentation are used to obtain infrared spectra: capabilities of FTIR spectroscopy systems. 3.1 Fourier Transform Infrared (FTIR) Spectroscopy. 3.1.1 Working Principle. Infrared spectroscopy is non destructive technique for materials analysis and. Page 1 of 12. FOURIER TRANSFORM INFRA-RED (FTIR) SPECTROSCOPY. PART ONE THEORY AND OPERATION PRINCIPLE OF FTIR SPECTROMETER.Introduction to infrared and IR spectroscopy. • How an FTIR bench works. • Why we use a way for the development of the theory of relativity.“ – Albert Einstein On the other hand, we can use reaction-induced FTIR difference spectroscopy to select vibrations corresponding to single chemical groups involved in a specific reaction. Various strategies are used to identify the IR signatures of each residue of interest in the resulting reaction-induced FTIR difference spectra. On the other hand, we can use reaction-induced FTIR difference spectroscopy to select vibrations corresponding to single chemical groups involved in a specific reaction. Various strategies are used to identify the IR signatures of each residue of interest in the resulting reaction-induced FTIR difference spectra. This booklet is an introduction to the concepts behind FTIR spectroscopy. It covers both the basic theory of FTIR and how it works as well as discussing some the