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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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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Raman scattering in molecular junctions: a pseudoparticle formulation.

Alexander J White1, Sergei Tretiak, Michael Galperin

  • 1Department of Chemistry and Biochemistry, University of California San Diego , La Jolla, California 92093, United States.

Nano Letters
|January 23, 2014
PubMed
Summary
This summary is machine-generated.

We developed a new Raman spectroscopy method for molecular junctions using many-body states. This approach accurately predicts spectral shifts and vibrational heating in electronic devices, advancing molecular junction research.

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Area of Science:

  • Condensed matter physics
  • Molecular electronics
  • Spectroscopy

Background:

  • Raman spectroscopy is crucial for understanding molecular vibrations.
  • Previous models for molecular junctions were limited.
  • Accurate modeling of electronic dynamics in junctions is challenging.

Purpose of the Study:

  • To present a many-body state formulation of Raman spectroscopy for molecular junctions.
  • To extend computational spectroscopy methods to non-equilibrium systems.
  • To enable atomistic quantum ab initio modeling of optical responses in molecular junctions.

Main Methods:

  • Formulation of Raman spectroscopy using a many-body state representation.
  • Application of first-principle simulations.
  • Comparison with experimental data for specific molecular junctions.

Main Results:

  • The new framework successfully simulates Raman response in molecular junctions.
  • Calculated Stokes line shifts and vibrational heating align with experimental findings.
  • Identified the OPV3 cation's role in Raman scattering under bias.

Conclusions:

  • The many-body approach offers a more comprehensive understanding of Raman spectroscopy in molecular junctions.
  • This method facilitates the integration of equilibrium spectroscopy tools into non-equilibrium junction studies.
  • The findings pave the way for advanced quantum modeling of molecular electronic devices.