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

Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

2.3K
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
2.3K
Electron Behavior00:54

Electron Behavior

111.0K
Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
111.0K
Electron Behavior01:09

Electron Behavior

14.5K
Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces associated with energy levels called shells and are further organized into subshells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus have less energy,...
14.5K
Types of Semiconductors01:20

Types of Semiconductors

1.8K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
1.8K
Fermi Level Dynamics01:12

Fermi Level Dynamics

1.0K
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...
1.0K
Energy Diagrams, Transition States, and Intermediates02:13

Energy Diagrams, Transition States, and Intermediates

22.4K
Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction coordinate represented on the horizontal axis shows how far the reaction has progressed structurally. Positions along the x-axis close to the reactants have structures resembling the reactants, while positions close to the products resemble the products.  Peaks on the energy diagram represent stable structures with measurable lifetimes, while...
22.4K

You might also read

Related Articles

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

Sort by
Same author

YS-1301 ameliorates crescentic glomerulonephritis by promoting immunoregulatory macrophages.

BMC nephrology·2026
Same author

Amnion-derived mesenchymal stem cells attenuate anti-GBM glomerulonephritis via regulation of neutrophil CD44 expression.

Stem cell research & therapy·2026
Same author

Evaluation of Puromycin-Induced Podocyte Injury and Protective Effects of Voclosporin Using Induced Pluripotent Stem Cells from a Patient with Nephrotic Syndrome Harboring an <i>INF2</i> Variant.

Stem cells and development·2026
Same author

Pediatric Cryptosporidiosis With Negative Microscopy but Positive Stool Polymerase Chain Reaction.

Pediatrics international : official journal of the Japan Pediatric Society·2026
Same author

CNS target engagement of high-dose DHA supplementation in older adults at risk for dementia: a randomised, double-blind, placebo-controlled trial.

EBioMedicine·2026
Same author

Early Antibiotic Discontinuation for Children With a Positive Rapid Respiratory Viral Test Hospitalized for Suspected Bacterial Tracheostomy-Associated Infections.

Pediatric pulmonology·2026

Related Experiment Video

Updated: Apr 6, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

9.3K

Inverse internal conversion in C4(-) below the electron detachment threshold.

Naoko Kono1, Takeshi Furukawa, Hajime Tanuma

  • 1Department of Physics, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachiouji-shi, Tokyo 192-0397, Japan. takeshi@tmu.ac.jp.

Physical Chemistry Chemical Physics : PCCP
|August 4, 2015
PubMed
Summary
This summary is machine-generated.

Photo-excited carbon cluster ions (C4(-)) undergo electronic radiative cooling, a process observed via fast fluorescence decay and neutral yield measurements. This cooling mechanism is significant even for ions with low internal energy.

More Related Videos

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

11.9K
Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

7.5K

Related Experiment Videos

Last Updated: Apr 6, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

9.3K
Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

11.9K
Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

7.5K

Area of Science:

  • Physical Chemistry
  • Molecular Spectroscopy
  • Chemical Physics

Background:

  • Understanding energy relaxation pathways in molecular ions is crucial for chemical dynamics.
  • Photo-excitation of molecular ions can lead to various relaxation processes, including dissociation and radiative decay.

Purpose of the Study:

  • To investigate the electronic radiative cooling mechanism in photo-excited C4(-) molecular ions.
  • To determine the contribution of inverse internal conversion and recurrent fluorescence to neutral yield.
  • To explore this cooling process for ions with internal energy below the detachment threshold.

Main Methods:

  • Time-resolved measurements of neutral yields from photo-excited C4(-) ions.
  • Observation of fast decay (10 μs range) in neutral yields.
  • Alternative approach involving laser wavelength and storage time dependence (ms range) of total photo-induced neutral yield.

Main Results:

  • Observed inverse internal conversion followed by recurrent fluorescence as a fast decay process (10 μs).
  • Elucidated the contribution of electronic radiative cooling to C4(-) ions even below the detachment threshold.
  • Demonstrated dependence of neutral yield on laser wavelength and storage time.

Conclusions:

  • Electronic radiative cooling is a significant relaxation pathway for C4(-) molecular ions.
  • This cooling mechanism is effective even for ions with internal energies substantially below the detachment threshold.
  • The study provides novel insights into the energy dynamics of molecular anions.