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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

530
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...
530
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...
593

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Related Experiment Video

Updated: Sep 9, 2025

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
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Monitoring Chemical Reactions Induced by Filamentation with Air-Lasing-Based Coherent Raman Spectroscopy.

Zelong Li1,2, Ning Zhang2,3, Siyi He2,3

  • 1School of Microelectronics, Shanghai University, Shanghai 200444, China.

The Journal of Physical Chemistry Letters
|August 28, 2025
PubMed
Summary

This study uses laser-based spectroscopy to simultaneously track ozone (O3) and nitrogen dioxide (NO2) formation after laser filamentation. Results show distinct reaction dynamics influenced by laser energy and environment, offering insights into atmospheric chemistry control.

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Area of Science:

  • Atmospheric Chemistry
  • Laser Spectroscopy
  • Chemical Dynamics

Background:

  • Simultaneous detection of multiple reaction products from laser-induced filamentation is vital for understanding atmospheric chemistry.
  • Technical challenges limit the simultaneous monitoring of species like ozone (O3) and nitrogen dioxide (NO2).

Purpose of the Study:

  • To develop and apply air-lasing-based coherent Raman spectroscopy for simultaneous detection of O3 and NO2.
  • To investigate the distinct reaction dynamics and evolution of O3 and NO2 after femtosecond laser filamentation.
  • To explore the influence of pump energy and reaction environment on O3 and NO2 formation.

Main Methods:

  • Utilized femtosecond laser filamentation in synthetic air.
  • Employed air-lasing-based coherent Raman spectroscopy for simultaneous monitoring.
  • Varied pump energy and reaction environments (synthetic vs. ambient air).

Main Results:

  • Demonstrated simultaneous detection and distinct reaction dynamics of O3 and NO2.
  • Observed that pump energy significantly affects reaction rates and species concentrations.
  • Found that lower energies favor O3 accumulation, while higher energies are needed for NO2 production.
  • Noted O3 signal absence in ambient air and slight differences in NO2 signals between synthetic and ambient air.

Conclusions:

  • The formation and evolution of O3 and NO2 are strongly dependent on experimental conditions.
  • Experimental findings provide a qualitative explanation of reaction pathways.
  • This research offers guidance for controlling atmospheric chemical reactions through laser-induced processes.