Scaled Molecular Dynamics Simulations for Ultraintense Laser-Cluster Interactions

摘要

New developments in the field of charge separation in large finite systems pertain to extreme ionization of elemental and molecular clusters in ultraintense laser fields(peak intensities 10-10 Wcm~(-2))with the production of highly charged ions(e.g.,completely ionized deuterium,water and methane clusters or Xe~(36+)).Concurrently and parallel to extreme ionization,Coulomb explosion occurs with the production of high-energy(keV-MeV)ions.The large cluster and nanodroplet sizes,for which Coulomb explosion drives efficient table-top dd fusion and nucleosynthesis with heavier nuclei,preclude the use of the traditional particle molecular dynamics simulation methods.We consider a scaling method for molecular dynamics and explore its validity conditions.The scaling method will be applicable for large finite systems(with a number of constituents up to 10~8 and sizes up to 100 nm)where particle motion is governed by long-range{e.g.,Coulomb)interactions.