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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

515
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...
515
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

512
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...
512
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

2.6K
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...
2.6K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

1.5K
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...
1.5K
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

1.1K
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...
1.1K

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Related Experiment Video

Updated: Aug 26, 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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Femtosecond coherent Raman system with >75 dB dynamic range for probing vibration modes across 250-2400 cm-1.

J Sylvester, C P Neupane, H A S Singhapurage

    Optics Express
    |October 13, 2022
    PubMed
    Summary

    We developed a new time-resolved Coherent Raman spectroscopy system. This advanced system offers exceptional time resolution and dynamic range for probing molecular vibrations.

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    Area of Science:

    • Spectroscopy
    • Physical Chemistry
    • Molecular Physics

    Background:

    • Coherent Raman spectroscopy (CRS) is a powerful technique for vibrational spectroscopy.
    • Achieving high time resolution and dynamic range in CRS is crucial for studying ultrafast molecular dynamics.

    Purpose of the Study:

    • To design and evaluate a novel time-resolved Coherent Raman spectroscopy system.
    • To demonstrate the system's capability for high-resolution probing of Raman active modes.

    Main Methods:

    • Development of a time-resolved Coherent Raman spectroscopy setup.
    • Characterization of system performance, including time resolution, dynamic range, and spectral resolution.

    Main Results:

    • The system achieves a time resolution better than 120 femtoseconds (fs).
    • Coherent transients are traceable with over 75 dB dynamic range.
    • The system probes Raman active modes across a 250-2400 cm⁻¹ frequency range.
    • An equivalent spectral resolution better than 0.1 cm⁻¹ is demonstrated.

    Conclusions:

    • The developed time-resolved CRS system offers superior performance metrics.
    • This system enables detailed investigations of ultrafast molecular processes with high precision.