RESPA: Time-Scale Decomposition

• Many systems display disparate time scales of motion

  • Massive particles interacting with light ones
    helium in argon
    
  • Stiff and loose potentials
    intramolecular and intermolecular forces
    

• Approach works as before

  • Integrate fast motions (degrees of freedom) using short time step
  • Integrate slow motions using long time step

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