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Related Concept Videos

Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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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...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

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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...
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Real-Time, Two-Color Stimulated Raman Scattering Imaging of Mouse Brain for Tissue Diagnosis
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Cross-phase modulation in two-dimensional spectroscopy.

Mao-Rui Cai, Xue Zhang, Zi-Qian Cheng

    Optics Express
    |February 1, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Two-dimensional (2D) spectroscopy using pump-probe geometry is affected by cross-phase modulation (XPM) from interfering pump pulses. Reducing probe pulse chirp minimizes XPM distortions in 2D spectroscopic signals.

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    Area of Science:

    • Spectroscopy
    • Physical Chemistry
    • Quantum Optics

    Background:

    • Two-dimensional (2D) spectroscopy is a powerful technique for studying ultrafast dynamics.
    • Pump-probe geometry offers advantages for 2D spectroscopy implementation.
    • Cross-phase modulation (XPM) can cause spectral distortions in transient absorption (TA) spectroscopy.

    Purpose of the Study:

    • To investigate the presence and origin of XPM in 2D spectroscopy with pump-probe geometry.
    • To characterize the behavior of XPM in 2D spectra as a function of experimental parameters.
    • To explore methods for mitigating XPM-induced distortions.

    Main Methods:

    • Utilized transient absorption (TA) spectroscopy in a pump-probe configuration.
    • Performed experimental measurements of 2D spectra.
    • Conducted numerical simulations to model XPM phenomena.
    • Investigated the effect of probe pulse chirp on spectral distortions.

    Main Results:

    • Demonstrated that XPM, induced by interfering pump pulses, affects 2D spectroscopy in a pump-probe geometry.
    • Observed oscillatory behavior of XPM in 2D spectra and its dependence on waiting time delay.
    • Quantified the influence of probe pulse chirp on the magnitude of XPM distortions.
    • Showed that compressing the probe pulse chirp reduces XPM impact.

    Conclusions:

    • XPM is a significant factor causing spectral distortions in 2D pump-probe spectroscopy.
    • The interference of pump pulses is the primary source of XPM in this configuration.
    • Probe pulse chirp management is a viable strategy to minimize XPM artifacts.
    • Understanding and controlling XPM is crucial for accurate interpretation of 2D spectroscopic data.