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Stereodynamics in NO(X) + Ar inelastic collisions.

M Brouard1, H Chadwick1, S D S Gordon1

  • 1The Department of Chemistry, University of Oxford, The Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, United Kingdom.

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Investigating the orientation of nitric oxide (NO) molecules before collisions with argon (Ar) revealed insights into molecular interactions. Quantum mechanics accurately predicted scattering behavior, highlighting interference effects.

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Area of Science:

  • Chemical Physics
  • Molecular Dynamics
  • Scattering Theory

Background:

  • Understanding molecular orientation effects in collisions is crucial for controlling chemical reactions.
  • Previous studies on nitric oxide (NO) collisions with rare gases observed parity pairs.

Purpose of the Study:

  • To investigate the influence of NO bond axis orientation on rotationally inelastic collisions with Argon (Ar).
  • To compare experimental measurements with quantum mechanical calculations for bond-orientation-resolved differential cross sections.

Main Methods:

  • Modified velocity-map imaging ion optics for hexapole state-selected NO orientation.
  • Experimental measurement of bond orientation resolved differential cross sections.
  • Quantum mechanical and classical theoretical calculations.

Main Results:

  • Good agreement between experimental and theoretical results for spin-orbit conserving transitions.
  • Absence of parity pairs due to coherent superposition of Λ-doublet levels in the orienting field.
  • Differential steric effect depends mainly on the final rotational state, not the Λ-doublet level.

Conclusions:

  • Quantum interference, dominated by the repulsive potential region, explains the observed steric asymmetry.
  • Classical mechanics cannot quantitatively predict the observed steric asymmetry in NO + Ar collisions.