Polarization wake of penetrating ions: oscillator model

Abstract

The wake potential induced by a swift nonrelativistic ion has been studied theoretically for a random stopping medium consisting of quantal-harmonic-oscillator atoms. The primary purpose has been to study the influence of atomic binding on the frequently-studied wake potential in a Fermi gas. Quantitative comparisons at constant plasma frequency and increasing oscillator frequency show a gradual decrease in wavelength and a slight decrease in amplitude of the oscillatory part of the wake potential, as well as a systematic decrease in screening of the near-field next to the projectile. These findings can be expected on the basis of the Drude-Lorentz formula for the effective resonance frequency. We find a distinct dependence of the induced potential on the ion charge as long as the plasma frequency exceeds the oscillator frequency. In the opposite case of a dominating oscillator frequency we find little difference between the field induced by a point charge and that by a neutral atom. As an application area we briefly discuss the proximity effect in the energy loss of molecular ions. We find that the polarization wake modifies the proximity effect, in contrast to the frequently-expressed view that it causes the proximity effect.

Ion potential in warm dense matter: Wake effects due to streaming degenerate electrons

“…in Refs. [24][25][26][27], however, only in the zero-temperature limit. A similar analysis involving the zero-temperature dielectric function of streaming quantum electrons and neglecting electron-electron collisions was performed in Ref.…”

Neonization method for stopping, mean excitation energy, straggling, and for total and differential ionization cross sections of CH4, NH3, H2O and FH by impact of heavy projectiles

“…N = 10, is clear, with a small shoulder above this value (4%) around (5)(6)(7) MeV. This shoulder is shifted with respect to the maximum of the stopping power, as binary collisional formalisms would expect [89,90].…”

Interaction of H 2 + molecular beam with thin layer graphene foils*

“…[2,4,[20][21][22] And there are some theoretical models which assume that the electrons of molecular ions are stripped off once they contact the first atomic layer of the thin foil. [5,9,[23][24][25][26] In Ref. [27], the Rutherford backscattering energy spectrum of carbon fragments which were generated by a 1.847 MeV C + 2 cluster beam interacting with a silicon crystal target was used to measure the time when the Coulomb explosion just happened.…”