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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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.
Different compounds display unique properties due to their...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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.
The ATR process begins by directing a beam...
IR Spectrum Peak Intensity: Dipole Moment01:20

IR Spectrum Peak Intensity: Dipole Moment

The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...

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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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A Double Beam nterferometerfor the Middle Infrared.

R Hanel, M Forman, T Meilleur

    Applied Optics
    |January 15, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new double beam Michelson interferometer was developed for middle infrared spectroscopy. This versatile instrument achieves high resolution for atmospheric emission spectra analysis.

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    Area of Science:

    • Spectroscopy
    • Infrared technology
    • Optical instrumentation

    Background:

    • Michelson interferometers are crucial for spectroscopic analysis.
    • Existing designs may have limitations in beam utilization.
    • Middle infrared spectroscopy is vital for atmospheric studies.

    Purpose of the Study:

    • To construct a versatile double beam Michelson interferometer for the middle infrared region.
    • To utilize the beam splitter efficiently for both beam separation and recombination.
    • To achieve high-resolution spectral analysis of atmospheric emissions.

    Main Methods:

    • Construction of a novel double beam Michelson interferometer.
    • Operation of the moving mirror in a constant velocity mode.
    • Application of calibration and ratio recording techniques.

    Main Results:

    • The interferometer effectively uses the same beam splitter area for all interacting beams.
    • Spectra of atmospheric emissions were recorded between 750 cm(-1) and 1250 cm(-1).
    • A spectral resolution better than one wavenumber was achieved.

    Conclusions:

    • The developed Michelson interferometer is a versatile tool for middle infrared spectroscopy.
    • The design allows for efficient beam utilization and high-resolution measurements.
    • This instrument is suitable for detailed analysis of atmospheric emission spectra.