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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

1.0K
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...
1.0K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

2.7K
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...
2.7K
UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

6.5K
The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

4.5K
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...
4.5K
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

28.1K
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...
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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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Generation depth modeling in time domain diffuse Raman spectroscopy: the homogeneous case.

Alessandro Bossi, Valerio Gandolfi, Andrea Farina

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    |November 11, 2025
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    Summary
    This summary is machine-generated.

    This study introduces a new analytical model to determine the average generation depth of Raman photons. This model improves the interpretation of time domain diffuse Raman spectroscopy (TD-DIRS) and spatially offset Raman spectroscopy (SORS) measurements.

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    Area of Science:

    • * Spectroscopy and Photonics
    • * Biomedical Optics

    Background:

    • * Accurate depth profiling is crucial for interpreting Raman spectroscopy data, especially in biological tissues.
    • * Existing models may not fully account for wavelength-dependent optical properties.
    • * Time domain diffuse Raman spectroscopy (TD-DIRS) and spatially offset Raman spectroscopy (SORS) are valuable non-invasive techniques.

    Purpose of the Study:

    • * To develop a rigorous analytical model for calculating the average generation depth of Raman photons.
    • * To investigate the dependence of generation depth on photon time-of-flight and source-detector distance.
    • * To enhance the interpretation of TD-DIRS and SORS measurements.

    Main Methods:

    • * Development of an analytical model based on the diffusion equation.
    • * Inclusion of wavelength-dependent optical property variations.
    • * Validation using Monte Carlo simulations.

    Main Results:

    • * The model accurately calculates average Raman photon generation depth.
    • * Generation depth is quantified in relation to photon time-of-flight (TD-DIRS) and source-detector distance (SORS).
    • * Simulations of in vivo scenarios demonstrate the model's applicability.

    Conclusions:

    • * The proposed model provides fundamental knowledge for improving SORS and TD-DIRS data interpretation.
    • * It offers a more accurate estimation of probed depth in diffusive media.
    • * This advancement is critical for applications in biomedical diagnostics and research.