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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

594
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...
594
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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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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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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Related Experiment Video

Updated: Oct 18, 2025

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

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UV laser pulse trains for Raman spectroscopy.

Dustin Swanson, Phillip Sprangle

    Optics Letters
    |October 1, 2021
    PubMed
    Summary

    A new stimulated Raman spectroscopy method uses a UV laser pulse train to excite full Raman spectra and induce a Raman wakefield for molecular classification. This technique offers enhanced spectral analysis capabilities.

    Area of Science:

    • Spectroscopy
    • Laser Physics
    • Physical Chemistry

    Background:

    • Stimulated Raman spectroscopy (SRS) is a powerful vibrational spectroscopy technique.
    • Existing SRS methods may have limitations in spectral excitation range or complexity.
    • Advanced laser pulse shaping offers new possibilities for spectroscopic control.

    Purpose of the Study:

    • To formulate and simulate a novel stimulated Raman spectroscopy process.
    • To investigate the use of a UV probe laser pulse train for spectral excitation.
    • To explore the induction and application of a Raman wakefield for molecular classification.

    Main Methods:

    • Theoretical framework formulation and numerical simulation.
    • Utilizing a UV laser pulse train with multi-femtosecond micro-pulses.

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  • Varying inter-pulse separation to control spectrum excitation.
  • Incorporating Kerr and non-resonant effects into the model.

    • Main Results:

    • Demonstrated excitation of the full Raman spectrum by controlling micro-pulse separation.
    • Induced a Raman wakefield containing complete Raman signatures of complex molecules.
    • Simulated the Raman spectrum of a specific pathogen for illustration.

    Conclusions:

    • The novel UV laser pulse train SRS method enables full Raman spectrum excitation.
    • The induced Raman wakefield provides a new channel for molecular classification.
    • This technique shows promise for analyzing complex molecules and pathogens.