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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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 the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

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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Updated: Jun 5, 2026

Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering (CARS)
12:56

Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering (CARS)

Published on: October 17, 2010

Multiresonant coherent multidimensional spectroscopy.

John C Wright1

  • 1Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. wright@chem.wisc.edu

Annual Review of Physical Chemistry
|December 21, 2010
PubMed
Summary
This summary is machine-generated.

Multiresonant coherent multidimensional spectroscopy uses tunable pulses to study molecular interactions. This advanced technique enhances spectral resolution and minimizes congestion for clearer insights into vibrational and electronic states.

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Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering (CARS)
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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Quantum Mechanics

Background:

  • Multiresonant coherent multidimensional spectroscopy is a frequency-domain technique.
  • It utilizes tunable excitation pulses to probe molecular systems.

Purpose of the Study:

  • To elucidate the principles and applications of multiresonant coherent multidimensional spectroscopy.
  • To highlight its capability in exciting multiple quantum coherences (MQCs) and state populations.

Main Methods:

  • Employing fully or partially coherent excitation pathways.
  • Scanning excitation frequencies and time delays to generate multidimensional spectra and measure dynamics.
  • Exciting various combinations of vibrational and electronic states.

Main Results:

  • Coupled states re-emit light at their frequency differences, forming phase-matched output beams.
  • Scanning parameters reveals coherent and incoherent dynamics of MQCs.
  • Cross-peaks identify coupled states, reducing spectral congestion.
  • Narrowing inhomogeneous broadening enhances spectral resolution.

Conclusions:

  • Multiresonant methods offer enhanced spectral resolution and reduced congestion.
  • This technique provides detailed insights into molecular interactions and dynamics.
  • It enables selective excitation and probing of complex quantum systems.