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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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.
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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

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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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Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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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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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

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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: Jan 8, 2026

Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS
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Cavity-enhanced phase-matched coherent Stokes Raman spectroscopy.

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    Coherent Raman scattering in an optical cavity dramatically enhances signals from trace gases. This ultrasensitive method surpasses spontaneous Raman scattering by over a billion times.

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    Area of Science:

    • Spectroscopy
    • Quantum Optics
    • Chemical Analysis

    Background:

    • Standard Raman spectroscopy suffers from low sensitivity due to small scattering cross-sections.
    • Coherent Raman spectroscopy techniques aim to overcome these limitations.
    • Optical enhancement cavities can amplify weak spectroscopic signals.

    Purpose of the Study:

    • To develop and demonstrate an ultrasensitive detection method for trace gaseous molecules.
    • To intensify Raman signals using phased-matched coherent Stokes Raman scattering within a high-finesse optical cavity.
    • To quantify the signal enhancement compared to spontaneous Raman scattering.

    Main Methods:

    • Utilizing phased-matched coherent Stokes Raman scattering.
    • Employing a macroscopic high-finesse optical enhancement cavity.
    • Pumping the cavity with a narrow-band continuous-wave laser.
    • Directly measuring the ratio of coherent to spontaneous Raman scattering signals in a gaseous medium.

    Main Results:

    • Achieved an enhancement ratio exceeding 10^9 for coherent Raman scattering signals over spontaneous Raman scattering.
    • The measured enhancement ratio closely matched theoretical predictions.
    • Demonstrated the method's effectiveness for trace gas detection.

    Conclusions:

    • The proposed method offers a significant advancement in ultrasensitive detection of trace gases.
    • This technique is particularly promising for homonuclear diatomic molecules undetectable by absorption spectroscopy.
    • The high enhancement factor validates the use of optical cavities in coherent Raman spectroscopy for trace analysis.