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Related Concept Videos

Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Induced Electric Fields01:23

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...

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Related Experiment Video

Updated: Jul 2, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

On-the-fly, electric-field-driven, coupled electron-nuclear dynamics.

Garth A Jones1, Angela Acocella, Francesco Zerbetto

  • 1Department of Biological Sciences, UniVersity of Essex, Wivenhoe Park, Colchester CO43SQ, United Kingdom. garth@essex.ac.uk

The Journal of Physical Chemistry. A
|September 5, 2008
PubMed
Summary

We developed a new computational method to simulate how electric fields affect water molecule photodissociation. This approach reveals how vibrations can disrupt electronic coherence and trap molecules in excited states, impacting photochemical reactions.

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Last Updated: Jul 2, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
06:58

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization

Published on: July 12, 2016

Finite Element Modelling of a Cellular Electric Microenvironment
08:23

Finite Element Modelling of a Cellular Electric Microenvironment

Published on: May 18, 2021

Area of Science:

  • Computational Chemistry
  • Photochemistry
  • Quantum Dynamics

Background:

  • Understanding light-induced chemical reactions is crucial in photochemistry.
  • Modeling electron-nuclear dynamics in excited states presents significant computational challenges.

Purpose of the Study:

  • To develop and apply a novel on-the-fly, electric field-driven, coupled electron-nuclear dynamics approach.
  • To model the photodissociation of water in the A((1)B1) excited state under electric field influence.

Main Methods:

  • Combines quantum propagation for electronic dynamics (ultrafast timescale) with quasi-classical surface hopping for nuclear dynamics (slower timescale).
  • Explicitly includes strong system-field interactions in the electronic propagator.
  • Utilizes an on-the-fly dynamics approach for computational efficiency.

Main Results:

  • Demonstrates the method's capability to study rapid photon-induced bond dissociation.
  • Reveals partial breakdown of electronic coherence due to molecular vibrations detuning the system from the applied field.
  • Shows electronic population trapping in the excited state.

Conclusions:

  • The developed method provides a practical tool for simulating light-molecule interactions leading to photochemical events.
  • Highlights the significant role of electric fields and molecular vibrations in controlling photodissociation dynamics.
  • Offers insights into the fundamental processes governing excited-state dynamics and coherence loss.