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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 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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IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

1.5K
In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

5.8K
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...
5.8K
IR Spectrum01:19

IR Spectrum

3.3K
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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High-coherence mid-infrared frequency comb.

I Galli, F Cappelli, P Cancio

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    Researchers generated a mid-infrared frequency comb with exceptional single-tooth coherence. This breakthrough in laser technology offers high power spectral density for advanced applications.

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    Generation and Coherent Control of Pulsed Quantum Frequency Combs
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    Area of Science:

    • Quantum Optics
    • Laser Physics
    • Spectroscopy

    Background:

    • Frequency combs are crucial for high-precision measurements.
    • Mid-infrared (mid-IR) frequency combs are valuable for molecular spectroscopy.
    • Achieving high coherence in mid-IR combs remains a challenge.

    Purpose of the Study:

    • To generate a mid-infrared frequency comb with unprecedented single-tooth coherence.
    • To demonstrate a novel method for producing a high-power spectral density comb in the mid-IR region.

    Main Methods:

    • Generation of a frequency comb around 4330 nm within a Ti:sapphire laser cavity.
    • Utilizing a difference-frequency generation process.
    • Implementing a phase-lock scheme based on direct digital synthesis.

    Main Results:

    • Achieved a single-tooth linewidth of 2.0 kHz on a 1-second timescale (750 Hz in 20 ms).
    • Generated a per-tooth power of 1 μW.
    • Demonstrated high power spectral density, comparable to the best mid-IR combs.

    Conclusions:

    • The developed frequency comb exhibits superior coherence and power spectral density in the mid-IR.
    • This advancement opens new possibilities for high-resolution spectroscopy and other applications.
    • The phase-locking technique provides a robust method for stabilizing mid-IR frequency combs.