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Related Concept Videos

Elastic Collisions: Introduction01:00

Elastic Collisions: Introduction

An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
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It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a problem,...
Elastic Collisions: Case Study01:15

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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Rotational alignment effects in NO(X) + Ar inelastic collisions: a theoretical study.

M Brouard1, H Chadwick, C J Eyles

  • 1The Department of Chemistry, University of Oxford, The Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom. mark.brouard@chem.ox.ac.uk

The Journal of Chemical Physics
|March 22, 2013
PubMed
Summary

The hard shell interaction potential primarily causes rotational alignment in NO(X)-Ar collisions. Differences in scattering dynamics, not alignment, explain parity-resolved trends in rotational states.

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Area of Science:

  • Chemical Physics
  • Molecular Dynamics
  • Quantum Mechanics

Background:

  • Investigating rotational angular momentum alignment in molecular collisions is crucial for understanding chemical reaction dynamics.
  • Nitric oxide (NO(X)) scattering with Argon (Ar) provides a benchmark system for studying these effects.

Purpose of the Study:

  • To elucidate the primary factors governing rotational angular momentum alignment in NO(X)-Ar inelastic scattering.
  • To differentiate the roles of interaction potential and scattering dynamics in observed alignment phenomena.

Main Methods:

  • Employed close-coupled quantum mechanical calculations.
  • Utilized quasi-classical trajectory simulations.
  • Performed Monte Carlo hard shell scattering calculations.

Main Results:

  • The hard shell nature of the interaction potential at 66 meV collision energy is the main driver of NO(X) rotational alignment.
  • Quantum mechanical parity-resolved alignment parameters show alternating trends with rotational state changes (Δj).
  • The kinematic apse model shows excellent agreement with quantum mechanical theory under specific energy conditions.

Conclusions:

  • The hard shell potential dominates rotational alignment, while scattering dynamics influence parity-dependent cross sections.
  • Rotational alignment and differential cross sections probe distinct aspects of scattering dynamics.
  • The kinematic apse model is a valid approximation for NO(X)-Ar scattering when collision energy exceeds potential well depth.