Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Energy Associated With a Charge Distribution01:21

Energy Associated With a Charge Distribution

1.6K
The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.
1.6K
Fermi Level Dynamics01:12

Fermi Level Dynamics

341
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
341
Fermi Level01:18

Fermi Level

811
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
811
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
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,...
1.1K
Continuous Charge Distributions01:17

Continuous Charge Distributions

7.2K
Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
7.2K
Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

52.6K
The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
52.6K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Fragmentation dynamics of CS2 dications and trications following S 2p ionization.

The Journal of chemical physics·2026
Same author

The simulation of X-ray absorption spectra including vibronic coupling: application of the QD-DFT/MRCI(2) method.

Physical chemistry chemical physics : PCCP·2025
Same author

Shake-Down Spectroscopy as State- and Site-Specific Probe of Ultrafast Chemical Dynamics.

Journal of the American Chemical Society·2025
Same author

Minimum Energy Conical Intersection Optimization Using DFT/MRCI(2).

Journal of chemical theory and computation·2025
Same author

Effect of A-DNA and B-DNA Conformation on the Interplay between Local Excitations and Charge-Transfer States in the Ultrafast Decay of Guanine-Cytosine Stacked Dimers: A Quantum Dynamical Investigation.

The journal of physical chemistry. A·2025
Same author

A DFT/MRCI Hamiltonian parameterized using only ab initio data. II. Core-excited states.

The Journal of chemical physics·2024

Video Experimental Relacionado

Updated: Sep 10, 2025

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

9.8K

Transferencia de carga de cinco segundos en el núcleo

Simon P Neville1, Martha Yaghoubi Jouybari2, Michael S Schuurman1,2

  • 1National Research Council Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada.

The journal of physical chemistry letters
|August 21, 2025
PubMed
Resumen

La transferencia de carga ultrarrápida a nivel del núcleo ocurre en femtosegundos después de la excitación de rayos X, lo que lleva a la localización de agujeros en el núcleo en moléculas como el etileno. Este rápido cambio de densidad de electrones es observable durante el decaimiento de Auger.

Más Videos Relacionados

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

7.0K
An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
09:49

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

Published on: October 23, 2018

16.1K

Videos de Experimentos Relacionados

Last Updated: Sep 10, 2025

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

9.8K
Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

7.0K
An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
09:49

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

Published on: October 23, 2018

16.1K

Área de la Ciencia:

  • Química Cuántica
  • Dinámica molecular
  • Atosegundo Ciencia

Sus antecedentes:

  • Los procesos electrónicos a nivel del núcleo son fundamentales para la espectroscopia molecular.
  • Comprender la dinámica ultrarrápida es crucial para controlar las reacciones químicas.
  • Los efectos no adiabáticos juegan un papel significativo en el comportamiento molecular del estado excitado.

Objetivo del estudio:

  • Investigar la posibilidad de una transferencia de carga ultra rápida a nivel del núcleo después de la excitación por rayos X.
  • Explorar el papel de la dinámica no adiabática en la redistribución de la densidad de electrones del núcleo.
  • Para predecir la escala de tiempo y la observabilidad de estos fenómenos.

Principales métodos:

  • Predicción teórica de la dinámica de transferencia de carga ultrarrápida.
  • Simulación de la excitación por rayos X del etileno a su colector 1sπ*.
  • Análisis de la transferencia de densidad de electrones y la localización del agujero nuclear.

Principales resultados:

  • Se prevé una transferencia de carga ultrarrápida (algunos femtosegundos) a nivel del núcleo.
  • Transferencia observada de la densidad núcleo-electrón a través de la molécula dentro de 5 fs.
  • Localización prevista del agujero del núcleo debido a la transferencia de carga.

Conclusiones:

  • La transferencia de carga ultrarrápida a nivel del núcleo es un fenómeno predecible impulsado por dinámicas no adiabáticas.
  • Estas dinámicas ocurren dentro de la ventana de desintegración de Auger, haciéndolas observables experimentalmente.
  • El estudio proporciona información sobre el comportamiento fundamental de los electrones en las moléculas excitadas.