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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.
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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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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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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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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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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Polarized Raman spectroscopy for studying two-dimensional materials.

Jungcheol Kim1, Jae-Ung Lee2, Hyeonsik Cheong1

  • 1Department of Physics, Sogang University, Seoul 04107, Republic of Korea.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 10, 2020
PubMed
Summary

Polarized Raman spectroscopy offers precise analysis of two-dimensional materials (2DMs) by controlling light polarization for accurate phonon mode assignments and crystallographic orientation determination. This technique enhances the study of diverse 2DMs like graphene and transition metal chalcogenides.

Keywords:
Ramangraphenepolarizationtwo-dimensional material

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Spectroscopy

Background:

  • Raman spectroscopy is a key technique for analyzing two-dimensional materials (2DMs).
  • Unpolarized light can lead to ambiguous phonon mode assignments in Raman spectra.
  • Determining crystallographic orientation is crucial for understanding 2DM properties.

Purpose of the Study:

  • To explain the fundamentals of polarized Raman spectroscopy for 2DMs research.
  • To review the applications of polarized Raman spectroscopy in studying both isotropic and anisotropic 2DMs.
  • To highlight how polarization control enhances Raman analysis of 2DMs.

Main Methods:

  • Utilizing controlled polarization of incident and scattered photons in Raman scattering.
  • Applying Raman selection rules to phonon modes for accurate assignments.
  • Analyzing polarized Raman spectra to determine crystallographic orientation in 2DMs.

Main Results:

  • Polarized Raman spectroscopy enables unambiguous phonon mode assignments.
  • The technique accurately determines the crystallographic orientation of 2DMs, including those with strain.
  • Demonstrates enhanced capabilities for studying a wide range of 2DMs.

Conclusions:

  • Polarized Raman spectroscopy is an essential tool for advanced 2DMs characterization.
  • This method provides deeper insights into the structural and electronic properties of 2DMs.
  • Its application is vital for the continued research and development of two-dimensional materials.