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Infrared (IR) Spectrometry is an analytical technique based on the principle that molecules absorb specific frequencies of infrared radiation, causing transitions in their vibrational energy levels. The absorption of IR radiation corresponds to the vibrational modes of chemical bonds within a molecule, and each functional group exhibits characteristic absorption bands. This principle allows the identification of molecular structures and the presence of specific functional groups in organic and inorganic compounds. IR spectroscopy is based on the fundamental concept of molecular vibrations, which include stretching, bending, rocking, wagging, and twisting motions of atoms in a molecule. The frequencies of these vibrations are influenced by the masses of the atoms and the strength of the chemical bonds. When a molecule is irradiated with infrared light, it absorbs radiation at frequencies that match its natural vibrational modes, leading to a spectrum that serves as a molecular fingerprint. The instrumentation of IR spectrometry consists of several key components. The IR source produces a broad spectrum of infrared radiation, commonly using a heated filament or a Globar source. The radiation passes through a sample, which can be in solid, liquid, or gaseous form. The sample absorbs specific frequencies of the IR radiation, depending on its molecular structure. The transmitted radiation is then collected and directed toward a detector. Modern instruments often use a Fourier Transform Infrared (FTIR) spectrometer, which employs an interferometer to modulate the IR beam. The interferometer generates an interferogram, which is a complex signal representing all frequencies simultaneously. This signal is converted into a conventional IR ____ __________ ________ ______ ___ _______ _______ _________.
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