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Related Concept Videos

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

Two-Dimensional (2D) NMR: Overview

1.6K
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....
1.6K
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

2.0K
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...
2.0K
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

824
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
824
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

1.5K
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...
1.5K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

698
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
698
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.6K
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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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Multi-heterodyne two dimensional coherent spectroscopy using frequency combs.

Bachana Lomsadze1,2, Steven T Cundiff3,4

  • 1Department of Physics, University of Michigan, Ann Arbor, Michigan, 48109, USA.

Scientific Reports
|October 27, 2017
PubMed
Summary
This summary is machine-generated.

Frequency combs enable rapid, high-resolution, background-free multi-dimensional coherent spectroscopy for semiconductor materials. This novel approach overcomes limitations of current techniques, offering faster and clearer insights into material properties and dynamics.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Optical multi-dimensional coherent spectroscopy (MDCS) is crucial for analyzing ultrafast dynamics in various systems.
  • Existing MDCS methods suffer from long acquisition times, limited spectral resolution, and complex signal isolation techniques.
  • There is a need for faster, higher-resolution, and simpler MDCS techniques, especially for semiconductor materials.

Purpose of the Study:

  • To introduce a novel frequency comb-based approach for multi-dimensional coherent spectroscopy.
  • To achieve rapid, high-resolution, and background-free MDCS measurements.
  • To demonstrate the applicability of this new method for semiconductor materials analysis.

Main Methods:

  • Utilizing frequency combs, inspired by dual-comb spectroscopy principles.
  • Implementing a new experimental setup for MDCS.
  • Applying the technique to a Gallium Arsenide (GaAs) multi-quantum well sample.

Main Results:

  • Demonstrated rapid data acquisition for MDCS.
  • Achieved high spectral resolution in the measurements.
  • Successfully performed background-free spectroscopy on a semiconductor sample.

Conclusions:

  • The frequency comb approach offers a significant advancement over traditional MDCS techniques.
  • This method provides a powerful tool for efficient and detailed characterization of semiconductor materials.
  • The demonstrated technique paves the way for broader applications of MDCS in ultrafast science.