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Related Concept Videos

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...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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 first.
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...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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 have a...

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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Subharmonic Raman effect in nonlinear mixing.

G S Agarwal

    Optics Letters
    |September 12, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates fractional Raman resonances in nonlinear mixing processes across various materials. Theoretical models, both classical and quantum, are presented for these newly identified resonances.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics
    • Spectroscopy

    Background:

    • Recent experiments by Trebino and Rahn have spurred new investigations into nonlinear optical phenomena.
    • Understanding nonlinear mixing processes is crucial for advancements in spectroscopy and laser technology.

    Purpose of the Study:

    • To theoretically demonstrate the existence of fractional Raman resonances.
    • To explore these resonances in diverse material systems including atomic vapors, molecules, and solids.
    • To develop comprehensive theoretical models for these resonances.

    Main Methods:

    • General theoretical analysis based on principles of nonlinear optics.
    • Development of both classical and quantum mechanical models.
    • Extrapolation from recent experimental findings in the field.

    Main Results:

    • Proof of the general existence of fractional Raman resonances.
    • Identification of these resonances in atomic vapors, molecular systems, and solid-state materials.
    • Formulation of theoretical frameworks to describe the observed phenomena.

    Conclusions:

    • Fractional Raman resonances are a general feature of nonlinear mixing processes.
    • The presented theoretical models provide a foundation for further experimental and theoretical exploration.
    • This work expands the understanding of light-matter interactions in various condensed and gaseous phases.