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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...

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Related Experiment Video

Updated: Jun 19, 2026

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
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Published on: April 28, 2022

Radial profiling of microdroplets using cavity-enhanced Raman spectroscopy.

H B Lin, A J Campillo

    Optics Letters
    |October 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Cavity-enhanced Raman spectroscopy precisely mapped methanol-water droplet composition. Evaporation followed a diffusion-limited model, as confirmed by radial concentration changes.

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    Area of Science:

    • Physical Chemistry
    • Spectroscopy
    • Droplet Dynamics

    Background:

    • Understanding droplet evaporation is crucial for atmospheric science and industrial processes.
    • Previous methods lacked the spatial resolution to probe droplet composition changes.
    • Methanol-water mixtures are common in various applications, necessitating detailed study.

    Purpose of the Study:

    • To radially resolve the composition of methanol-water droplets.
    • To investigate the evaporation dynamics of these droplets.
    • To validate theoretical models of droplet evaporation.

    Main Methods:

    • Utilized cavity-enhanced Raman spectroscopy (CERS) for high-sensitivity analysis.
    • Employed a 514.5-nm laser to excite optical cavity modes within 7.7-microm-radius droplets.
    • Analyzed spontaneous Raman scattered light to determine species identity and concentration.

    Main Results:

    • Successfully achieved radial resolution of methanol and water concentrations within droplets.
    • Observed distinct radial zones corresponding to different optical cavity modes.
    • Measured methanol concentration profiles showed good agreement with a diffusion-limited evaporation model.

    Conclusions:

    • CERS is a powerful technique for probing the internal composition of microdroplets.
    • The evaporation of methanol-water droplets is governed by diffusion limitations.
    • This study provides experimental validation for evaporation models at the microscale.