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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

2.1K
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
2.1K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.7K
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....
1.7K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.5K
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
1.5K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

758
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...
758
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

2.1K
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...
2.1K
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...
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Updated: Mar 12, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

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Perspective: Two-dimensional resonance Raman spectroscopy.

Brian P Molesky1, Zhenkun Guo1, Thomas P Cheshire1

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.

The Journal of Chemical Physics
|November 17, 2016
PubMed
Summary
This summary is machine-generated.

Two-dimensional resonance Raman (2DRR) spectroscopy offers enhanced insights into photochemical reactions and complex molecular structures. This technique reveals correlations not seen in traditional Raman methods, highlighting its potential for future chemical research.

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Area of Science:

  • Chemical Physics
  • Spectroscopy
  • Photochemistry

Background:

  • Two-dimensional resonance Raman (2DRR) spectroscopy is a powerful technique for studying complex systems.
  • It utilizes electronic resonance enhancement to selectively probe specific molecules within their environments.
  • 2DRR provides information beyond traditional Raman methods through spectral correlations.

Purpose of the Study:

  • To discuss the capabilities of 2DRR spectroscopy in analyzing photochemical reaction mechanisms.
  • To explore the application of 2DRR in understanding structural heterogeneity in complex systems.
  • To compare 2DRR with off-resonant 2D Raman spectroscopy.

Main Methods:

  • Application of 2DRR spectroscopy to photodissociation reactions.
  • Analysis of spectral line shapes to identify structural heterogeneity.
  • Comparison of signal generation mechanisms between 2DRR and off-resonant 2D Raman spectroscopy.

Main Results:

  • 2DRR spectroscopy can correlate distributions of reactant and product geometries on femtosecond timescales.
  • Structural heterogeneity in ensembles is reflected in 2D spectroscopic line shapes.
  • A tradeoff exists between sensitivity and artifact susceptibility in 2DRR versus off-resonant 2D Raman spectroscopy.

Conclusions:

  • 2DRR spectroscopy offers unique insights into reaction dynamics and structural complexity.
  • Recent advancements indicate significant future potential for 2DRR applications.
  • The technique is valuable for studying chromophores in complex biological and chemical systems.