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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.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Applications of IR Spectroscopy: Overview01:11

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
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Surface enhanced hyper Raman scattering (SEHRS) and its applications.

Fani Madzharova1, Zsuzsanna Heiner1, Janina Kneipp1

  • 1Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany. janina.kneipp@chemie.hu-berlin.de.

Chemical Society Reviews
|May 23, 2017
PubMed
Summary

Surface enhanced hyper Raman scattering (SEHRS) provides complementary vibrational spectroscopic data with high selectivity and sensitivity. This technique, a non-linear analogue of SERS, offers advantages for probing molecules at low concentrations and in the near-infrared spectrum.

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Area of Science:

  • Spectroscopy
  • Nanotechnology
  • Physical Chemistry

Background:

  • Surface enhanced hyper Raman scattering (SEHRS) is a non-linear optical process.
  • It involves molecules interacting with plasmonic nanostructures.
  • SEHRS is analogous to surface enhanced Raman scattering (SERS) but with distinct characteristics.

Purpose of the Study:

  • To review the vibrational spectroscopic information obtainable via SEHRS.
  • To discuss research contributing to the understanding of SEHRS.
  • To provide directions for future SEHRS spectroscopy applications.

Main Methods:

  • Analysis of spontaneous, two-photon excited Raman scattering.
  • Utilizing high local optical fields generated by plasmonic nanostructures.
  • Leveraging complementary spectroscopic information and non-linear excitation enhancement.

Main Results:

  • SEHRS offers complementary spectroscopic information due to different selection rules.
  • Non-linearity in excitation leads to stronger signal enhancement.
  • Practical advantages include high selectivity for molecule-surface interactions and probing low concentrations.

Conclusions:

  • SEHRS provides unique vibrational spectroscopic insights.
  • The technique offers significant advantages for molecular analysis.
  • Future applications are promising in biophotonics and materials research.