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Related Concept Videos

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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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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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...
799
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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Atomic Emission Spectroscopy: Interference01:30

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Pulse overlap artifacts and double quantum coherence spectroscopy.

Albin Hedse1, Alex Arash Sand Kalaee2, Andreas Wacker2

  • 1Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden.

The Journal of Chemical Physics
|April 15, 2023
PubMed
Summary
This summary is machine-generated.

Artifacts in nonlinear spectroscopy can mimic double quantum coherence (DQC) signals. Careful analysis of pulse overlap is crucial, as artifacts may outweigh true DQC signals, especially with short dephasing times.

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Area of Science:

  • Nonlinear spectroscopy
  • Quantum coherence phenomena
  • Many-body correlation effects

Background:

  • Double quantum coherence (DQC) signals provide unique insights into many-body correlations.
  • These signals are often short-lived, with significant generation occurring during pulse overlap.
  • Artifacts arising from pulse overlap can complicate signal interpretation.

Purpose of the Study:

  • To investigate the impact of pulse overlap on DQC signal detection in nonlinear spectroscopy.
  • To determine if pulse overlap artifacts can be misinterpreted as genuine DQC signals.
  • To provide guidelines for distinguishing true DQC signals from artifacts.

Main Methods:

  • Explicit calculations of phase-modulated two-pulse experiments were performed.
  • Simulations were conducted for both two-level and three-level systems.
  • Analysis involved examining signals at modulation frequencies and Fourier transforms over pulse delay.

Main Results:

  • A significant signal mimicking DQC was observed in a two-level system where DQC is impossible.
  • In a three-level system, the pulse-overlap artifact was found to be potentially stronger than the true DQC signal.
  • The artifact signal appeared at the modulation frequency, while the Fourier transform showed a double frequency.

Conclusions:

  • Pulse overlap artifacts can be substantial and potentially mask or be mistaken for true DQC signals.
  • Realistic dephasing times exacerbate the issue, making artifacts more prominent.
  • Researchers should exercise caution and consider delays greater than 1.5 times the pulse length for reliable DQC analysis.