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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

1.3K
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
1.3K
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
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

870
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
870
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

2.0K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
2.0K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.3K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Updated: May 1, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Isolating quantum coherence using coherent multi-dimensional spectroscopy with spectrally shaped pulses.

Jonathan O Tollerud, Christopher R Hall, Jeffrey A Davis

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    Spectral shaping in coherent multidimensional spectroscopy isolates signal pathways. This technique reveals quantitative details of coherent coupling between spatially separated excitons in quantum wells.

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    Area of Science:

    • Quantum optics
    • Condensed matter physics
    • Spectroscopy

    Background:

    • Coherent multidimensional spectroscopy (CMD) is a powerful tool for probing quantum systems.
    • Understanding exciton interactions in quantum wells is crucial for developing advanced optical devices.

    Purpose of the Study:

    • To demonstrate spectral shaping for isolating specific signal pathways in CMD.
    • To quantitatively analyze coherent coupling between spatially separated excitons.

    Main Methods:

    • Utilizing spectral shaping in coherent multidimensional spectroscopy.
    • Selectively exciting pathways involving coherent superposition of exciton states.
    • Achieving a dynamic range exceeding 10^4 in electric field amplitude.

    Main Results:

    • Successfully isolated and analyzed weak coherent coupling between spatially separated excitons.
    • Elucidated details of coherent interactions in an asymmetric double quantum well.
    • Enabled quantitative comparisons of different signal pathways.

    Conclusions:

    • Spectral shaping provides a direct method for accessing quantitative details of exciton interactions.
    • This approach facilitates a comprehensive description of electronic states and their interactions in quantum systems.