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

Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
Reynolds Transport Theorem01:24

Reynolds Transport Theorem

The Reynolds transport theorem provides a framework to relate the time rate of change of an extensive property within a system to that in a control volume, which is crucial for analyzing fluid dynamics. Extensive properties, such as mass, velocity, acceleration, temperature, and momentum, can be expressed in terms of the mass of a fluid portion. These properties are called extensive because they depend on the system's size, while intensive properties are their corresponding values per unit mass.
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

You might also read

Related Articles

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

Sort by
Same author

Detecting supramolecular organic nanoparticles during heat wave.

Science (New York, N.Y.)·2026
Same author

Recent Advances in Ozone Photochemistry: A Lambda Doublet Propensity and Spin-Forbidden Channels.

Annual review of physical chemistry·2025
Same author

Imaging study of O3 photodissociation in the Huggins band.

The Journal of chemical physics·2024
Same author

Burst-mode velocimetry of hypersonic flow by nitric oxide ionization induced flow tagging and imaging.

Optics letters·2024
Same author

Rotational Distributions and Imaging of Singlet O<sub>2</sub> Following Spin-Forbidden Photodissociation of O<sub>3</sub>.

The journal of physical chemistry. A·2023
Same author

Ozone Photodissociation in the Singlet Channel at 226 nm.

The journal of physical chemistry. A·2022

Related Experiment Videos

Stereodynamics of multistate roaming.

Michael P Grubb1, Michelle L Warter, Simon W North

  • 1Department of Chemistry, Texas A&M University, College Station, P.O. Box 30012, Texas 77842. swnorth@tamu.edu.

Physical Chemistry Chemical Physics : PCCP
|April 7, 2012
PubMed
Summary

This study details the photodissociation of nitrate (NO3) into nitric oxide (NO) and oxygen (O2). Findings confirm a constrained planar dissociation mechanism, revealing insights into roaming dynamics in chemical reactions.

Related Experiment Videos

Area of Science:

  • Chemical Physics
  • Molecular Dynamics
  • Photochemistry

Background:

  • Understanding the photodissociation of nitrate (NO3) is crucial for atmospheric chemistry and reaction dynamics.
  • Previous studies suggested roaming mechanisms for NO3 dissociation but lacked confirmation of planar constraints.

Purpose of the Study:

  • To provide a molecular-level description of NO3 photodissociation pathways.
  • To characterize the stereodynamics of NO fragment formation.
  • To investigate the role of geometric constraints in roaming dynamics.

Main Methods:

  • Ion imaging experiments were employed to study state-selected NO fragments.
  • Vector correlation and Lambda doublet propensity measurements were performed.
  • Ab initio calculations and theoretical studies were utilized.

Main Results:

  • Both observed NO3 dissociation pathways were confirmed to arise from roaming mechanisms on different electronic potentials.
  • Speed-dependent vector correlation measurements confirmed constrained planar dissociation.
  • Strong perpendicular correlations between velocity and angular momentum vectors were observed for NO fragments.

Conclusions:

  • The photodissociation of NO3 proceeds via constrained planar mechanisms, contrary to unconstrained abstractions in other roaming systems.
  • Geometric constraints are prevalent in roaming dynamics and analogous to bimolecular abstraction reactions.
  • This study provides a detailed molecular-level understanding of NO3 photodissociation stereodynamics.