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Related Concept Videos

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.
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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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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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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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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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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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Angularly Resolved Tip-Enhanced Raman Spectroscopy.

Felix Schneider1, Tim Parker1, Liangxuan Wang1

  • 1Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076, Tübingen, Germany.

Angewandte Chemie (International Ed. in English)
|June 23, 2025
PubMed
Summary
This summary is machine-generated.

This study reveals how tip-enhanced Raman spectroscopy (TERS) gap directs molecular vibrations, affecting signal intensity and angular distribution. Understanding this is key for analyzing molecular orientation and chemical reactions with TERS.

Keywords:
Angular‐resolved emissionAntenna directivityBack focal plane imagingEnergy momentum spectroscopyTip‐enhanced Raman spectroscopy

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Area of Science:

  • Surface Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Tip-enhanced Raman spectroscopy (TERS) is a powerful nanoscale imaging technique.
  • The angular distribution of TERS signals, crucial for signal formation, has been experimentally unexplored.

Purpose of the Study:

  • To experimentally investigate the angular distribution of Raman scattering in the TERS gap.
  • To correlate observed angular distributions with molecular vibrational modes and TERS gap effects.

Main Methods:

  • Utilized a model system of cobalt (II) hexadecafluoro-phthalocyanine (CoPcF16) on a gold surface.
  • Analyzed Fourier plane TERS signals, comparing in-plane and out-of-plane vibrational modes.
  • Employed density functional theory (DFT) and finite-difference time-domain (FDTD) simulations for interpretation.

Main Results:

  • Observed distinct angular intensity distributions for in-plane and out-of-plane vibrational modes.
  • Demonstrated that the TERS gap directs Raman scattering differently based on molecular vibrational modes.
  • Identified specific Raman modes at ~678, 740, 1309, and 1373 cm−1 with unique angular patterns.

Conclusions:

  • The TERS gap significantly influences the angular distribution of Raman scattering.
  • This directional effect is mode-dependent, impacting spectral features like peak intensity ratios.
  • Findings are vital for accurate molecular orientation studies and chemical reaction monitoring using TERS.