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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

488
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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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

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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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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.2K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.2K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.5K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.1K
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

1.2K
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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Sub-Doppler Double-Resonance Spectroscopy of Methane Using a Frequency Comb Probe.

Aleksandra Foltynowicz1, Lucile Rutkowski2, Isak Silander1

  • 1Department of Physics, Umeå University, 901 87 Umeå, Sweden.

Physical Review Letters
|February 26, 2021
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Summary
This summary is machine-generated.

This study demonstrates sub-Doppler molecular spectroscopy using a frequency comb as a probe. The technique accurately measures methane transitions, verifying theoretical models for exoplanet atmosphere analysis.

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Area of Science:

  • Molecular Spectroscopy
  • Quantum Optics
  • Astrophysics

Background:

  • Accurate modeling of exoplanet atmospheres requires precise spectroscopic data for molecules like methane.
  • High-resolution spectroscopy is crucial for understanding molecular energy levels and transitions.

Purpose of the Study:

  • To report the first sub-Doppler molecular spectroscopy measurement using a frequency comb as a probe.
  • To verify theoretical predictions for highly vibrationally excited states of methane.
  • To assess the accuracy of theoretical line lists for high-temperature spectral modeling.

Main Methods:

  • Employed optical-optical double-resonance spectroscopy.
  • Utilized a 3.3 μm continuous wave pump laser.
  • Used a 1.67 μm frequency comb as a probe.
  • Measured sub-Doppler transitions to the 2ν₃ and 3ν₃ bands of methane.

Main Results:

  • Achieved approximately 1.7 MHz center frequency accuracy for methane transitions.
  • Provided the first experimental verification of theoretical predictions for highly excited vibrational states.
  • Observed good agreement between measured transition frequencies and the TheoReTS line list for the 3ν₃ band.

Conclusions:

  • The frequency comb-based technique enables high-accuracy sub-Doppler molecular spectroscopy.
  • Experimental data validates theoretical models for high-temperature molecular spectra, essential for exoplanet studies.
  • This method advances the characterization of molecular spectra relevant to planetary atmospheres.