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Area of Science:

  • Chemical Physics
  • Quantum Mechanics
  • Molecular Dynamics

Background:

  • Accurate potential energy models are crucial for understanding chemical reaction dynamics.
  • Spin-orbit coupling significantly influences the behavior of heavy-atom systems like H + I.

Purpose of the Study:

  • To analyze bound and quasi-bound states in H + I collisions using a novel spin-orbit coupled diabatic potential energy model.
  • To investigate elastic and inelastic scattering processes and the role of resonances in H + I collisions.
  • To compare calculations using a full diabatic model with approximations based on single adiabatic states.

Main Methods:

  • Utilized a recently developed spin-orbit coupled diabatic potential energy model for HI.
  • Performed thorough analysis of ro-vibronic bound and quasi-bound states.
  • Computed elastic and inelastic scattering cross sections and thermal rates up to 12,500 cm⁻¹.
  • Analyzed resonances by their energy, width, lifetime, and decay probabilities.

Main Results:

  • The spin-orbit coupled diabatic model accurately describes complex dynamics in H + I collisions.
  • Calculations revealed detailed properties of bound and quasi-bound states.
  • Resonances were identified and characterized, influencing thermal rates.
  • Decay probabilities of high-energy resonances were studied for photodissociation branching ratios.

Conclusions:

  • The developed potential energy model is effective for studying H + I scattering dynamics.
  • Resonances play a significant role in the thermal rates and photodissociation branching ratios.
  • Approximations using single adiabatic states were evaluated against the full diabatic model.