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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...
Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...

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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
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Modulated FT-Raman Fiber-Optic Spectroscopy:  A Technique for Remotely Monitoring High-Temperature Reactions in

J B Cooper1, K L Wise, B J Jensen

  • 1Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia 23529, and NASA Langley Research Center, Hampton, Virginia 23681.

Analytical Chemistry
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

A new modification to FT-Raman spectrometers eliminates thermal backgrounds in spectra, even at high temperatures. This technique enhances signal quality and is cost-effective for researchers studying materials at elevated temperatures.

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Published on: November 18, 2015

Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Fourier Transform Raman (FT-Raman) spectroscopy is a powerful technique for molecular analysis.
  • High-temperature measurements are often plagued by thermal background noise, limiting spectral quality.
  • Existing methods for background reduction are insufficient for extreme temperatures.

Purpose of the Study:

  • To develop a cost-effective modification for commercial FT-Raman spectrometers.
  • To eliminate thermal background noise in FT-Raman spectra at high temperatures.
  • To improve signal-to-noise ratio for high-temperature Raman spectroscopy.

Main Methods:

  • Incorporated a mechanical chopper to modulate the continuous wave (CW) laser.
  • Utilized fiber optics for remote signal collection.
  • Connected a digital signal processor lock-in amplifier for signal demodulation and filtering.

Main Results:

  • Successfully eliminated thermal backgrounds in FT-Raman spectra at temperatures exceeding 370 °C.
  • Achieved a higher signal-to-noise ratio compared to conventional FT-Raman spectroscopy.
  • Demonstrated the ability to collect spectra using existing spectrometer software.

Conclusions:

  • The modified FT-Raman spectrometer effectively removes thermal noise, enabling high-temperature analysis.
  • This innovation provides superior spectral quality and is easily implemented.
  • Represents the first report of FT-Raman spectra above 300 °C without thermal interference.