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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Applications of IR Spectroscopy: Overview01:11

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Methodology for computing Fourier-transform infrared spectroscopy interferograms.

B N Carnio, O Moutanabbir, A Y Elezzabi

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    Summary
    This summary is machine-generated.

    This study presents a numerical method for evaluating Fourier-transform infrared (FTIR) spectroscopy interferograms, accounting for internal reflections and arbitrary spectral content. The model provides accurate interferogram analysis for diverse FTIR system applications.

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    Area of Science:

    • Spectroscopy
    • Optical Engineering
    • Computational Physics

    Background:

    • Fourier-transform infrared (FTIR) spectroscopy is vital for commercial applications.
    • Accurate modeling of FTIR systems is crucial for reliable performance.
    • Understanding interferogram signal behavior under various conditions is essential.

    Purpose of the Study:

    • To develop a numerical method for evaluating FTIR interferogram signals.
    • To model the effects of internal reflections within beam splitters and compensating plates.
    • To obtain interferograms in absolute units for arbitrary incident electric fields.

    Main Methods:

    • Numerical evaluation of the interferogram signal in FTIR systems.
    • Incorporation of multiple internal reflections within beam splitters (BS) and compensating plates (CP).
    • Assessment of models with and without a compensating plate for various spectral distributions.

    Main Results:

    • The developed model accurately assesses interferograms with arbitrary spectral content.
    • Internal reflections within the BS and CP are quantitatively evaluated.
    • Interferograms are obtained in absolute units for blackbody and random spectral distributions.

    Conclusions:

    • The presented methodology enables robust numerical evaluation of FTIR interferograms.
    • The model accounts for critical optical phenomena like internal reflections.
    • This work supports the design, implementation, and servicing of commercial FTIR systems.