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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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

IR Spectroscopy: Molecular Vibration Overview

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

IR Frequency Region: Fingerprint Region

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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...
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Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

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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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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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Frequency-comb-referenced mid-infrared source for high-precision spectroscopy.

Jari Peltola, Markku Vainio, Thomas Fordell

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    |January 22, 2015
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    Summary
    This summary is machine-generated.

    We developed a tunable mid-infrared optical parametric oscillator (OPO) locked to a stabilized optical frequency comb. This enables high-precision spectroscopy of gases like nitrous oxide, water, and methane.

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    Implementation of a Reference Interferometer for Nanodetection
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    Area of Science:

    • Spectroscopy
    • Quantum Optics
    • Laser Physics

    Background:

    • Optical parametric oscillators (OPOs) are versatile sources for tunable mid-infrared (mid-IR) light.
    • Stabilizing OPOs to optical frequency combs (OFCs) enhances their precision and stability.
    • High-resolution spectroscopy in the mid-IR is crucial for molecular analysis and trace gas detection.

    Purpose of the Study:

    • To report a tunable continuous-wave mid-infrared optical parametric oscillator (OPO) locked to a stabilized near-infrared optical frequency comb.
    • To demonstrate frequency-comb-locked scans with high precision and mode-hop-free operation.
    • To showcase the applicability of this technique for high-resolution molecular spectroscopy.

    Main Methods:

    • Locking a mid-IR OPO to a near-IR OFC using a frequency doubling scheme.
    • Implementing 40 GHz mode-hop-free, frequency-comb-locked scans.
    • Utilizing cavity-ring-down spectroscopy (CRDS) for gas analysis.

    Main Results:

    • Successful generation of a tunable mid-IR OPO locked to an OFC.
    • Demonstration of mode-hop-free scans between 2.7 and 3.4 μm.
    • High-precision CRDS measurements of N2O and H2O at 2.85 µm and CH4 at 3.2 μm.

    Conclusions:

    • The developed OPO-OFC system provides a robust platform for high-precision mid-IR spectroscopy.
    • This technique significantly advances the capability for sensitive detection and analysis of molecular gases.
    • The method is applicable to various scientifically relevant molecules in the mid-IR region.