Ir spectroscopy absorption12/29/2023 The FTIR itself cannot distinguish where along the beampath the burden of the concentration lies, nor can it distinguish between a narrow concentrated plume or a broad diluted plume that is contained within its beampath. The open-path FTIR system can be likened to a "particle counter" that sums up the total amount of energy a target chemical absorbs between the FTIR sending unit and the detector. Prominent examples would be noble gases, vapor-phase metals, and homonuclear diatomics (e.g., O 2, N 2, Cl 2). Note that not all contaminants absorb in the infrared range. Also, the amplitude of absorbance is proportional to the analyte concentration. Thus, each contaminant has characteristic infrared spectra that can be used to identify the compound. The contaminant (analyte) absorbs the infrared light at frequencies specific to the functional groups present in the molecule. IR analysis, including FTIR, relies on passing a collimated beam of infrared light through or onto the sample or atmosphere containing contaminants.
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