Coulomb Explosion Imaging
Coulomb Explosion Imaging - Related Videos
08:51
Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Cited by 5 •
2017
For small chiral species, Coulomb Explosion Imaging provides a new approach to determine the handedness of individual molecules.
10:33
Research and Development of High-performance Explosives
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Cited by 2 •
2016
Developmental testing of high explosives for military applications involves small-scale formulation, safety testing, and finally detonation performance tests to verify theoretical calculations. This paper will share typical development tests associated with the measurement of detonation velocity and detonation pressure.
08:35
Minimum Burning Pressures of Water-based Emulsion Explosives
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2017
We present an apparatus based on hot-wire ignition in a pressurized enclosure and an associated methodology to measure the minimum pressure required to induce sustained combustion in water-based emulsion explosives. This method improves product characterization to allow one to use them more safely during pumping and mixing operations.
01:30
Coulomb's Law
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2023
Experiments with electric charges have shown that if two objects each have an electric charge, they exert an electric force on each other. The magnitude of the force is linearly proportional to the net charge on each object and inversely proportional to the square of the distance between them. The direction of the force vector is along the imaginary line joining the two objects and is dictated by the signs of the charges involved. Newton's third law applies to the Coulomb force — the force on...
01:15
Coulomb's Law and The Principle of Superposition
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2023
Coulomb's Law describes the force experienced by two point charges under each other's presence. But what if there are more than two charges? For example, if there is a third charge, does it experience a force that is a simple combination of the individual forces due to the first two charges? Can it be described mathematically? The Principle of Superposition answers the question. Yes, Coulomb's Law applies to each pair of charges, and the net force on each charge is the vector sum of the...
FAQs
The ionization event must occur faster than substantial nuclear rearrangement. Under that condition, the charged nuclei begin repelling before the molecular framework can change significantly, so the measured fragments retain information about the structure at the moment of ionization. This timing also makes it possible to examine molecular motion rather than only the final products of a reaction.
After multiple ionization, positively charged nuclei repel one another through Coulomb forces. The directions and magnitudes of the resulting fragment momenta reflect how the nuclei were arranged when the charge was created. By analyzing those momentum vectors, researchers can infer molecular geometry and follow changes in nuclear motion during processes such as bond breaking or dissociation.
Fragment charge states identify how many positive charges remain on the separated nuclei or molecular fragments. Because the Coulomb repulsion depends on the charged state of the system, charge-state measurements provide essential context for interpreting the observed momenta. Combining charge information with three-dimensional momentum data strengthens the reconstruction of molecular geometry and dynamics.
A molecule first undergoes rapid multiple ionization, produced by an intense laser pulse or another ionizing event. The experiment then records the momenta of the resulting fragments together with their charge states. Researchers use these measurements to reconstruct the molecular geometry and evaluate how the nuclei moved during the ionization and fragmentation process.
The technique is particularly useful for studying ultrafast bond breaking, dissociation pathways, and correlated nuclear motion. These measurements reveal how different parts of a molecule move in relation to one another as a reaction unfolds. The resulting structural and dynamical information complements spectroscopy and reaction-dynamics studies, especially when rapid molecular changes are central to the question.
Three-dimensional momentum maps provide a detailed record of fragment directions and motion after ionization. Researchers can compare these experimentally determined patterns with theoretical descriptions of molecular processes. Agreement or disagreement helps test how well a model represents bond breaking, dissociation, or correlated nuclear motion, making the method useful for connecting measured reaction dynamics with chemical theory.