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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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Raman Spectroscopy: Overview01:20

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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...
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Ultrahigh-Vacuum Tip-Enhanced Raman Spectroscopy.

Eric A Pozzi, Guillaume Goubert, Naihao Chiang

  • 1Department of Chemistry, University of Illinois at Chicago , Chicago, Illinois 60607, United States.

Chemical Reviews
|December 23, 2016
PubMed
Summary
This summary is machine-generated.

Tip-enhanced Raman spectroscopy (TERS) in ultrahigh vacuum (UHV) offers molecular-level insights into surface processes. This technique provides site-resolved chemical analysis, crucial for advancing fields like catalysis and nanoelectronics.

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Area of Science:

  • Surface science
  • Spectroscopy
  • Nanotechnology

Background:

  • Molecule-surface interactions are vital for technologies like catalysis and photovoltaics but are poorly understood at the molecular level.
  • Surface inhomogeneity leads to variations in molecular properties across different sites, which ensemble-averaged techniques cannot capture.
  • Site-resolved analysis requires techniques with nanoscale lateral resolution, chemical sensitivity, and single-molecule detection capabilities.

Purpose of the Study:

  • To review tip-enhanced Raman spectroscopy (TERS) experiments conducted in ultrahigh vacuum (UHV) environments.
  • To discuss recent advancements and guide future research directions in UHV-TERS.
  • To highlight TERS's utility in interrogating single-molecule properties, reactions, and dynamics.

Main Methods:

  • Tip-enhanced Raman spectroscopy (TERS) utilizing a nanoscale plasmonic probe to confine and amplify light.
  • Performing TERS experiments within ultrahigh vacuum (UHV) conditions.
  • Achieving spatial resolution below 1 nm for detailed surface analysis.

Main Results:

  • TERS in UHV enables molecular-resolution imaging in pristine environments.
  • UHV conditions facilitate low-temperature operation, minimize molecular degradation, and enhance stability under irradiation.
  • TERS demonstrates capability for site-resolved chemical analysis and interrogation of single-molecule behavior.

Conclusions:

  • TERS in UHV is a powerful technique for understanding molecule-surface interactions at the nanoscale.
  • Recent advances showcase TERS's potential for detailed studies of surface chemistry and dynamics.
  • The technique is poised to significantly impact fields requiring molecular-level surface understanding.