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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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 the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...

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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
07:44

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Published on: April 28, 2016

Raman scattering in current-carrying molecular junctions.

Michael Galperin1, Mark A Ratner, Abraham Nitzan

  • 1Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. migalperin@ucsd.edu

The Journal of Chemical Physics
|April 17, 2009
PubMed
Summary
This summary is machine-generated.

We developed a theory for Raman scattering in molecular junctions. This approach reveals new contributions to light scattering signals under electrical bias, including effects from excited states and interference.

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Area of Science:

  • Condensed Matter Physics
  • Molecular Electronics
  • Spectroscopy

Background:

  • Raman scattering is a key spectroscopic technique for probing molecular vibrations.
  • Understanding light-matter interactions in molecular junctions is crucial for nanoelectronic devices.
  • Previous studies focused on spectroscopy without considering vibrational effects or non-equilibrium conditions.

Purpose of the Study:

  • To develop a theoretical framework for Raman scattering in current-carrying molecular junctions.
  • To incorporate molecular vibrations and state-to-state scattering fluxes into a nonequilibrium Green's function (NEGF) formalism.
  • To analyze the impact of electrode coupling and bias voltage on Raman scattering signals.

Main Methods:

  • Combined nonequilibrium Green's function (NEGF) formalism with generalized scattering theory.
  • Developed machinery for calculating state-to-state Raman scattering fluxes.
  • Analyzed the contributions from ground and excited electronic states, and interference terms.

Main Results:

  • Identified new contributions to the Raman scattering signal arising from excited molecular states and interference under sufficient voltage bias.
  • Demonstrated that the theory reduces to the standard Raman scattering expression for isolated molecules (no electrode coupling).
  • Discussed the influence of electrode coupling and bias on the total Raman scattering and its components.

Conclusions:

  • The developed theory provides a comprehensive description of Raman scattering in biased molecular junctions.
  • Charge-transfer contributions to surface-enhanced Raman scattering (SERS) in biased junctions are explained.
  • The findings are relevant for understanding and designing molecular electronic devices and advanced spectroscopic techniques.