Chaotic features in classical scattering processes between ions and atoms

A numerical study has been done of collisions between protons and hydrogen atoms, treated as classical particles, at low impact velocities. The presence of chaos has been looked for by investigating the processes with standard techniques of the chaotic--scattering theory. The evidence of a sharp transition from nearly regular scattering to fully developed chaos has been found at the lower velocities.Comment: 10 pages, Latex, 3 figures (available upon request to the authors), submitted to Journal of Physics

Fermi shuttle type multiple electron scattering in atomic collisions

We present three body classical trajectory Monte Carlo calculations for ionization in slow 1 50 keV u N on Ar collisions. According to the calculations, at smaller projectile energies ionization occurs mostly due to multiple scattering processes. At 1 keV u impact energy, we found rather long 6 14 fold scattering sequence

Atomic data for integrated tokamak modelling – Fermi-shuttle type ionization as a possible source of high energy electrons

The ionization of Ar by 15 keV N+ ion is studied theoretically. The energy distributions of the ejected electrons as a function of the scattering angle were calculated using the classical trajectory Monte Carlo method. We identify the signature of the Fermi-shuttle type ionization in the double differential cross sections which should be a possible source of the high energy electrons in the plasma. Our classical calculation also describes the previously measured data with high accuracy

Accelerating multiple scattering of the emitted electrons in collisions of ions with atoms and molecules

Double differential cross sections for electron emission were measured in the collisions of N ions with N2, Ne and Ar targets in the 700 1500 keV impact energy range. We studied the target atomic number dependence of the Fermi shuttle type acceleration mechanism. The experimental double differential cross sections are in good agreement with the theoretical values obtained from CTMC calculations for argon target. According to the calculations, multiple scattering contribution to the Ar spectra above 300 eV is significan