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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

2.0K
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...
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
2.1K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

5.8K
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...
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Updated: May 5, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:48

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

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Forward Raman scattering spectral properties.

Kangyi Cao, Jian Li, Xin Huang

    Optics Express
    |May 4, 2026
    PubMed
    Summary
    This summary is machine-generated.

    Forward Raman scattering is more easily collected in optical sensing than backward scattering due to differences in effective sensing length. This study provides a theoretical foundation for advancing optical sensing technologies.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Sensing Technology

    Background:

    • Forward and backward Raman scattering in fibers have broad applications in optical communications, sensing, chemical detection, and bio-medicine.
    • While backward Raman scattering is established in distributed optical sensing, forward Raman scattering research is less developed.
    • Understanding spontaneous forward Raman scattering is crucial for advancing optical sensing capabilities.

    Purpose of the Study:

    • To theoretically analyze the transmission of spontaneous forward Raman scattering light in optical fibers.
    • To derive analytical expressions for spontaneous forward Raman scattering in the time domain.
    • To elucidate and compare the spectral power distribution of forward and backward Raman scattering.

    Main Methods:

    • Theoretical analysis of spontaneous forward Raman scattering light transmission.
    • Derivation of analytical expressions in the time domain.
    • Numerical simulations and experimental validation of spectral power distribution.

    Main Results:

    • Forward Raman scattering light integrates signals over the entire fiber length.
    • Backward Raman scattering light is a superposition within a shorter spatial scale (optical pulse width).
    • Forward scattering light is more easily collected than backward scattering light due to this disparity.

    Conclusions:

    • The difference in effective sensing fiber length significantly impacts signal collection efficiency.
    • This research clarifies the spectral properties of forward and backward Raman scattering.
    • Provides a theoretical basis for enhancing optical sensing technologies using Raman scattering.