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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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.
According to Hooke's law, the vibrational frequency is directly proportional to the...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Related Experiment Video

Updated: Jun 12, 2026

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

Kondo resonances in molecular devices.

Gavin David Scott1, Douglas Natelson

  • 1Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA. gavin.scott@rice.edu

ACS Nano
|June 24, 2010
PubMed
Summary

This review explores the Kondo effect in single-molecule devices, detailing its origins and observable Kondo resonance. It highlights how these nanoscale systems reveal complex electron interactions beyond traditional quantum chemistry.

Area of Science:

  • Condensed Matter Physics
  • Nanotechnology
  • Quantum Chemistry

Background:

  • Molecular electronic devices enable study of nanoscale physical phenomena.
  • The Kondo effect, a strongly correlated electronic state, manifests as a Kondo resonance in conductance.
  • Traditional quantum chemistry methods do not fully capture electron-electron interactions causing the Kondo effect.

Purpose of the Study:

  • To review the origins and phenomenology of Kondo resonances in single-molecule devices.
  • To focus on the spin-1/2 Kondo state from a single unpaired electron.
  • To explore exotic systems like higher spin states in the Kondo regime.

Main Methods:

  • Analysis of Kondo resonance in single-molecule devices.
  • Spectroscopic investigation of molecular orbital transitions and vibrational modes.

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Last Updated: Jun 12, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

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  • Review of experimental advances in nanoscale device manipulation.

    • Main Results:

    • Kondo resonances provide insights into strongly correlated electronic states.
    • Single-molecule devices act as a spectroscopic tool for emergent Kondo behavior.
    • Experimental control over nanoscale devices is advancing.

    Conclusions:

    • Single-molecule devices are crucial for understanding the Kondo effect and electron correlations.
    • The interplay between Kondo behavior and molecular properties is a rich area of study.
    • Advances in experimental techniques enhance control over these quantum systems.