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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

2.0K
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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Raman Spectroscopy Instrumentation: Overview01:26

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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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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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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Tip-enhanced Raman spectroscopy - from early developments to recent advances.

Tanja Deckert-Gaudig1, Atsushi Taguchi, Satoshi Kawata

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Tip-enhanced Raman scattering (TERS) offers nanoscale chemical analysis with high specificity and sensitivity. This technique combines Raman spectroscopy and scanning probe microscopy for detailed molecular structure insights.

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Area of Science:

  • Nanoscale analytical techniques
  • Spectroscopy and microscopy
  • Surface science

Background:

  • Nanoscale analysis demands flexibility, specificity, sensitivity, and spatial confinement.
  • Tip-enhanced Raman scattering (TERS) emerges as a powerful technique meeting these demands.
  • TERS integrates Raman spectroscopy's chemical specificity with scanning probe microscopy's spatial resolution.

Purpose of the Study:

  • To review the development of Tip-Enhanced Raman Scattering (TERS) from its inception to recent advancements.
  • To highlight technical developments for stable Atomic Force Microscopy (AFM) and Scanning Tunneling Microscopy (STM) based TERS.
  • To assess the future potential and new concepts for TERS as a widely applicable technique.

Main Methods:

  • TERS utilizes plasmonic nanostructures to confine and amplify the electromagnetic field.
  • Combines Raman spectroscopy with AFM and STM for nanoscale chemical imaging.
  • Reviews technical instrument developments for reliable TERS operation.

Main Results:

  • TERS enables elucidation of chemical reaction mechanisms and component distribution at the nanoscale.
  • Provides molecular structure information inaccessible to other optical microscopy methods.
  • Demonstrates capabilities across inorganic, organic, and biological materials.

Conclusions:

  • TERS is a rapidly developing technique with increasing user adoption since 2000.
  • Ongoing advancements aim to make TERS a general, widely applicable tool.
  • Future TERS applications will focus on combining highest lateral resolution with extreme sensitivity.