Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Polar Equations of Conics01:29

Polar Equations of Conics

262
A conic section can be defined in polar coordinates as the set of all points whose distance from a fixed point, known as the focus, bears a constant ratio to their distance from a fixed line, known as the directrix. This constant ratio is called the eccentricity. This definition unifies all types of conic sections—ellipses, parabolas, and hyperbolas—under a single framework. When the focus is positioned at the origin of the polar coordinate system, a single polar equation can...
262
Nuclear Stability03:18

Nuclear Stability

23.4K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
23.4K
Radioactivity and Nuclear Equations03:18

Radioactivity and Nuclear Equations

27.6K
Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
A nuclide of an element has a specific number of protons and...
27.6K
Nuclear Binding Energy02:13

Nuclear Binding Energy

14.8K
The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons are bound...
14.8K
Non-nuclear Inheritance01:29

Non-nuclear Inheritance

23.3K
Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
23.3K
Nuclear Fusion02:45

Nuclear Fusion

33.9K
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
33.9K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Impact of Initial Electron Localization on Electron Solvation Dynamics in Liquid Water.

The journal of physical chemistry letters·2026
Same author

Enhancing Vibronic-Coupling Hamiltonian Parameterization with Machine Learning: The PyVCHAM Tool.

Journal of chemical theory and computation·2026
Same author

Photochemistry in plasmonic cavities: From perturbative to strong coupling regime.

The Journal of chemical physics·2026
Same author

Ultrafast radiation chemistry of glycine in aqueous solution.

The Journal of chemical physics·2026
Same author

Two-state reaction path search using a quantum Monte Carlo-inspired approach.

The Journal of chemical physics·2026
Same author

Effective Quantum Theory of EXAFS in a Dissipative Liquid-Phase Medium.

The journal of physical chemistry. B·2025

Related Experiment Video

Updated: Feb 11, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.7K

Control of Nuclear Dynamics through Conical Intersections and Electronic Coherences.

Caroline Arnold1,2,3, Oriol Vendrell1,3,4, Ralph Welsch1

  • 1Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany.

Physical Review Letters
|April 26, 2018
PubMed
Summary

Nuclear dynamics and conical intersections influence electronic coherences. Controlling nuclear wave packets via phase imprinting is possible near conical intersections, paving the way for attochemistry.

More Related Videos

Single Particle Electron Microscopy Reconstruction of the Exosome Complex Using the Random Conical Tilt Method
12:10

Single Particle Electron Microscopy Reconstruction of the Exosome Complex Using the Random Conical Tilt Method

Published on: March 28, 2011

24.0K
Production of Synthetic Nuclear Melt Glass
04:36

Production of Synthetic Nuclear Melt Glass

Published on: January 4, 2016

9.9K

Related Experiment Videos

Last Updated: Feb 11, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.7K
Single Particle Electron Microscopy Reconstruction of the Exosome Complex Using the Random Conical Tilt Method
12:10

Single Particle Electron Microscopy Reconstruction of the Exosome Complex Using the Random Conical Tilt Method

Published on: March 28, 2011

24.0K
Production of Synthetic Nuclear Melt Glass
04:36

Production of Synthetic Nuclear Melt Glass

Published on: January 4, 2016

9.9K

Area of Science:

  • Quantum dynamics
  • Molecular physics
  • Attochemistry

Background:

  • Electronic coherences are crucial for ultrafast molecular processes.
  • Conical intersections play a key role in nonadiabatic dynamics.
  • Understanding nuclear dynamics is essential for controlling molecular behavior.

Purpose of the Study:

  • Investigate the impact of nuclear dynamics and conical intersections on electronic coherences.
  • Explore the possibility of steering nuclear wave packets using photoionization.
  • Identify prerequisites for controlling molecular dynamics at the attosecond timescale.

Main Methods:

  • Utilized a two-state, two-mode linear vibronic coupling model.
  • Performed exact quantum dynamical calculations.
  • Employed the multiconfiguration time-dependent Hartree method.

Main Results:

  • Nonadiabatic coupling near the Franck-Condon point can preserve electronic coherence.
  • Steering of nuclear wave packets is achievable by imprinting a relative phase.
  • A coherent electronic wave packet with phase difference passing through a conical intersection enables steering.

Conclusions:

  • Conical intersections near the Franck-Condon point are essential for controlling nuclear wave packets.
  • The findings provide a pathway towards attochemistry and ultrafast molecular control.
  • Precise control over electronic coherences can be achieved through tailored photoionization.