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Related Concept Videos

Impulse01:13

Impulse

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According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the...
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Impulse Response01:17

Impulse Response

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The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
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...
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Theoretical Foundations of Nursing Practice01:30

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Theories play an essential role in organizing patient care. Theories refer to a proposed or followed belief, policy, or procedure that is the basis for action. Nursing theories are knowledge-based concepts that guide nurses' actions, influence nursing education and practice, and allow nurses to care for their patients.
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Theoretical Approaches to Psychological Disorder01:29

Theoretical Approaches to Psychological Disorder

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The development of psychological disorders, which are characterized by deviant, maladaptive, and personally distressing behaviors, has been explored through several theoretical approaches.
Biological approach
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Principle of Impulse and Moment01:15

Principle of Impulse and Moment

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When one considers a rigid body undergoing a plane motion, which is essentially a blend of translational and rotational movement, the application of Newton's second law gives the formula for the translational movement of such a body. If this equation is multiplied by a time interval, dt, and then integrated over the limits of integration, it results in an equation that embodies the principle of linear impulse.
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Impulse-Momentum Theorem00:49

Impulse-Momentum Theorem

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The total change in the motion of an object is proportional to the total force vector acting on it and the time over which it acts. This product is called impulse, a vector quantity with the same direction as the total force acting on the object.
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...
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Related Experiment Video

Updated: Feb 4, 2026

Impulsive Pressurization of Neuronal Cells for Traumatic Brain Injury Study
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Impulsive alignment of 4He-CH3I: A theoretical study.

Patricia Vindel-Zandbergen1, Ji Jiang2, Marius Lewerenz2

  • 1Laboratoire Collisions Agrégats Réactivité (LCAR), IRSAMC, Université de Toulouse, CNRS UMR 5589, Toulouse, France.

The Journal of Chemical Physics
|October 4, 2018
PubMed
Summary

Laser alignment of Helium-methyl iodide (He-CH3I) complexes shows distinct behaviors based on laser intensity. High intensities lead to dissociation and molecular rotation, while lower intensities prevent alignment due to He atom interaction.

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Area of Science:

  • Physical Chemistry
  • Quantum Mechanics
  • Molecular Dynamics

Background:

  • Non-adiabatic laser alignment studies molecular rotational dynamics.
  • Weakly bound complexes offer insights into molecule-environment interactions.

Purpose of the Study:

  • Simulate non-adiabatic laser alignment of the 4He-CH3I complex.
  • Investigate the influence of laser intensity on rotational dynamics and complex stability.

Main Methods:

  • Quantum mechanical wave packet calculations.
  • Utilized a model He-CH3I interaction potential.
  • Analyzed observables related to rotational motion.

Main Results:

  • Two distinct regimes observed based on laser intensity.
  • High intensity: complex dissociates, revealing molecular rotation and a bound fraction.
  • Low intensity: dissociation avoided, but alignment is inefficient due to He atom interaction.

Conclusions:

  • Laser intensity dictates the alignment and dissociation pathways of 4He-CH3I.
  • He atom interaction significantly influences or quenches molecular alignment.
  • Findings align with studies on linear molecules in helium environments.