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Glory scattering in deeply inelastic molecular collisions.

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We observed unexpected forward scattering in molecular collisions, challenging traditional models. This phenomenon, termed hard-collision glory scattering, arises from attractive forces during inelastic energy transfer.

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Area of Science:

  • Chemical Physics
  • Molecular Dynamics

Background:

  • Molecular trajectory deflection is a sensitive probe of interaction potentials.
  • Intuition suggests forward scattering from glancing collisions and back scattering from head-on collisions.

Purpose of the Study:

  • To investigate forward scattering in inelastic molecular collisions, defying conventional understanding.
  • To explain the observed forward scattering in deeply inelastic collisions between NO and CO or HD molecules.

Main Methods:

  • Observation of fully resolved pair-correlated differential cross-sections.
  • Analysis of deeply inelastic collisions between NO radicals and CO or HD molecules.
  • Extension of the hard-sphere scattering model to include inelastic energy transfer.

Main Results:

  • Observed forward scattering in inelastic processes, contradicting established scattering rules.
  • Identified forward scattering occurring at low impact parameters necessary for significant energy transfer.
  • Rationalized the phenomenon as hard-collision glory scattering, driven by attractive forces.

Conclusions:

  • Hard-collision glory scattering, caused by attractive forces, explains forward scattering in inelastic collisions.
  • This phenomenon is predicted to be widespread and has been identified in prior studies.
  • The study provides conditions for the occurrence of hard-collision glory scattering.