Related Experiment Video
Updated: Feb 10, 2026

Using In Vitro and In-cell SHAPE to Investigate Small Molecule Induced Pre-mRNA Structural Changes
Published on: January 30, 2019
Hyperfine-Structure-Induced Depolarization of Impulsively Aligned I_{2} Molecules
Esben F Thomas1, Anders A Søndergaard2, Benjamin Shepperson2
1Department of Chemistry, Technical University of Denmark, Building 206, DK-2800 Kongens Lyngby, Denmark.
Abstract:
A moderately intense 450 fs laser pulse is used to create rotational wave packets in gas phase I_{2} molecules. The ensuing time-dependent alignment, measured by Coulomb explosion imaging with a delayed probe pulse, exhibits the characteristic revival structures expected for rotational wave packets but also a complex nonperiodic substructure and decreasing mean alignment not observed before. A quantum mechanical model attributes the phenomena to coupling between the rotational angular momenta and the nuclear spins through the electric quadrupole interaction. The calculated alignment trace agrees very well with the experimental results.
Related Concept Videos
Impulse
Additionally, it can be shown that the...
Impulse Response
Kirchhoff's law forms an input signal equation, with the capacitor's current and voltage providing the output. Substituting the current and dividing by RC yields a differential equation. The output for an impulse input is the impulse...
Depolarizing Blockers: Pharmocokinetics
Depolarizing Blockers: Mechanism of Action
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
Principle of Impulse and Moment
Impulse-Momentum Theorem
By writing Newton's second law of motion in terms of the momentum of an object and the external force acting on it, and simultaneously using the definition of the impulse vector, it can be shown that the total impulse on an object is equal to its...

