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Related Concept Videos

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 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...
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...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

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,...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Sub-Doppler tunable far-infrared spectroscopy.

M Inguscio, L R Zink, K M Evenson

    Optics Letters
    |September 11, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers observed sub-Doppler linewidths using tunable far-infrared radiation in a methanol (CH(3)OH) cell. This breakthrough utilized a double-resonance technique with carbon dioxide (CO(2)) lasers.

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    Area of Science:

    • Molecular Spectroscopy
    • Laser Physics
    • Quantum Optics

    Background:

    • Sub-Doppler spectroscopy enables high-resolution molecular analysis.
    • Previous studies lacked experimental sub-Doppler linewidth observations in cells using tunable far-infrared radiation.

    Purpose of the Study:

    • To report the first experimental observation of sub-Doppler linewidths in a cell using tunable far-infrared radiation.
    • To demonstrate a novel spectroscopic technique for molecular excited states.

    Main Methods:

    • Employed a double-resonance technique.
    • Combined carbon dioxide (CO(2)) laser infrared radiation with tunable far-infrared radiation.
    • Investigated methanol (CH(3)OH) in an excited vibrational state.

    Main Results:

    • Achieved the first experimental observation of sub-Doppler linewidths in a cell.
    • Successfully observed a sub-Doppler line shape in an excited vibrational state of CH(3)OH.
    • Validated the efficacy of the combined laser approach for high-resolution spectroscopy.

    Conclusions:

    • The study establishes a new method for high-resolution molecular spectroscopy.
    • Tunable far-infrared radiation in combination with CO(2) lasers is effective for observing sub-Doppler features.
    • This technique opens avenues for detailed studies of molecular energy levels.