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Related Concept Videos

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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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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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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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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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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High-resolution, broadly-tunable mid-IR spectroscopy using a continuous wave optical parametric oscillator.

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    We developed an automated mid-infrared laser for spectroscopy, achieving wide, stable tuning. This new tunable laser source shows excellent agreement with spectral simulations for acetylene gas.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Laser Physics

    Background:

    • Mid-infrared (mid-IR) light sources are crucial for various spectroscopic applications.
    • Continuous tuning and mode-hop-free operation are desirable for high-resolution spectroscopy.
    • Existing mid-IR sources often require manual adjustments and lack extensive tuning ranges.

    Purpose of the Study:

    • To design and automate a continuous wave, singly-resonant optical parametric oscillator (SRO-OPO) for mid-IR generation.
    • To implement a tuning algorithm for hands-free, mode-hop-free tuning over a broad spectral range.
    • To demonstrate the utility of the automated OPO for mid-IR gas-phase spectroscopy.

    Main Methods:

    • Design and construction of a singly-resonant optical parametric oscillator.
    • Development of a hands-free control system and a tuning algorithm.
    • Spectroscopic measurement of acetylene (C2H2) gas using the OPO.
    • Comparison of experimental spectra with HITRAN 2016 simulations.

    Main Results:

    • Achieved hundreds of nanometers of continuous, effective-mode-hop-free tuning from 2190-4000 nm.
    • Demonstrated the OPO's applicability to mid-IR spectroscopy.
    • Obtained excellent agreement between experimental and simulated acetylene absorption spectra.
    • Reported reduced uncertainty in spectral peak centers compared to simulations.

    Conclusions:

    • The automated mid-IR SRO-OPO provides a versatile and stable light source for spectroscopy.
    • The implemented tuning algorithm enables robust, wide-range, mode-hop-free operation.
    • This technology advances mid-IR spectroscopic capabilities, offering improved accuracy in spectral analysis.