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Related Concept Videos

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...
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...
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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Related Experiment Video

Updated: Jun 19, 2026

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

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Ultrabroad-bandwidth multifrequency Raman generation.

G S McDonald, G H New, L L Losev

    Optics Letters
    |October 27, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We modeled transient stimulated rotational Raman scattering in hydrogen gas. Our findings predict a broad, multifrequency output generated with minimal delay, quantifying the roles of dispersion and transiency.

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    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

    Published on: July 25, 2022

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    Last Updated: Jun 19, 2026

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

    A Multimodal Wide-Field Fourier-Transform Raman Microscope

    Published on: December 30, 2025

    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
    09:57

    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

    Published on: July 25, 2022

    Area of Science:

    • Physics
    • Quantum Optics
    • Nonlinear Optics

    Background:

    • Stimulated Raman scattering (SRS) is a nonlinear optical process.
    • Hydrogen gas is a common medium for Raman scattering experiments.
    • Understanding transient effects is crucial for ultrafast optical applications.

    Purpose of the Study:

    • To model transient stimulated rotational Raman scattering (SRRS) in hydrogen gas.
    • To predict the spectral characteristics and temporal behavior of the generated light.
    • To quantify the influence of dispersion and transient effects on SRRS.

    Main Methods:

    • Numerical modeling of the nonlinear optical wave equations.
    • Simulation of SRRS in molecular hydrogen (H2).
    • Analysis of the output spectrum and pulse dynamics.

    Main Results:

    • Predicted a multifrequency output with a bandwidth exceeding the pump frequency.
    • Demonstrated that the multifrequency output can be generated with negligible delay relative to the pump pulses.
    • Quantified the significant roles of both dispersion and transiency in shaping the output.

    Conclusions:

    • Transient SRRS in H2 can generate broadband, frequency-shifted light with high temporal fidelity.
    • Dispersion and transiency are key factors controlling the output characteristics.
    • The findings have implications for developing advanced light sources for spectroscopy and nonlinear optics.