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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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...
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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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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.
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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Raman hyperspectral imaging spectrometer utilizing crystalline colloidal array photonic crystal diffraction.

Kyle T Hufziger1, Sergei V Bykov1, Sanford A Asher1

  • 1University of Pittsburgh, Department of Chemistry, 219 Parkman Avenue, Chevron Science Center, Room 701, Pittsburgh, PA 15260 USA.

Applied Spectroscopy
|October 22, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a new hyperspectral Raman imaging spectrometer using a photonic crystal for precise wavelength selection. This innovation allows detailed chemical mapping of surfaces by isolating specific spectral bands.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Spectroscopy

Background:

  • Hyperspectral Raman imaging offers detailed chemical information.
  • Traditional methods for spectral selection can be complex and less precise.
  • Photonic crystals provide unique wavelength-filtering properties.

Purpose of the Study:

  • To develop a novel hyperspectral Raman imaging spectrometer.
  • To utilize a photonic crystal for narrow-wavelength spectral interval selection.
  • To demonstrate the capability for spectrally detailed chemical imaging.

Main Methods:

  • Fabrication of a photonic crystal from self-assembled polystyrene particles.
  • Utilizing Bragg diffraction of the photonic crystal for wavelength selection.
  • Tuning the spectral interval by adjusting the incident angle of light.
  • Imaging a Teflon surface using the developed spectrometer.

Main Results:

  • The photonic crystal successfully selected a narrow spectral interval (~200 cm(-1)).
  • The spectrometer precisely isolated a close-lying triplet of Teflon Raman bands.
  • A Raman image of the Teflon surface was generated, detailing chemical composition.

Conclusions:

  • A novel hyperspectral Raman imaging spectrometer was successfully fabricated.
  • Photonic crystals are effective for narrow-wavelength selection in Raman spectroscopy.
  • The developed instrument enables spectrally detailed chemical imaging of surfaces.