From Microscopic to Macroscopic Modeling of Supersonic Seeded Atomic Beam
Two new techniques have been applied to the study of seeded atomic beams produced by expansion in vacuum. The first technique is a calculation of gas kinetic cross sections based on an improved Lennard-Jones potential. The second one is a new version of the Test Particle Monte Carlo method, able to treat at the same time the flow of majority and seed species in a quasi-continuum flow. Gas kinetic and transport cross sections for He/He and He/Ar scattering are calculated and discussed in comparison with available data. The momentum transfer cross section is included in the Monte Carlo model. Monte Carlo calculations are produced for macroscopic quantities in axial symmetric geometry and discussed in comparison with those obtained assuming rigid sphere scattering. The perspectives opened by the present procedure to seeded molecular beam investigations and to ion reaction studies are also shortly discussed.
KeywordsMolecular beams interaction potential cross sections Monte Carlo simulation
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