ELECTRON CAPTURES FROM HYDROGENIC IONS BY FULLY STRIPPED IONS IN STRONGLY COUPLED PLASMAS

In strongly coupled plasmas, plasma-screening effects are investigated on electron capture from hydrogenic ions by fully striped ion project iles using the classical Bohr-Lindhard model. The interaction potentia l in strongly coupled plasmas is described by the ion-sphere model pot ential. The electron capture radius is obtained by the ion-sphere inte raction potential and the kinetic energy of the released electron in t he frame of the projectile ion. The classical straight-line trajectory approximation is applied to the motion of the projectile ion in order to visualize the electron capture probability as a function of the im pact parameter, projectile energy, and ion-sphere radius. It is found that the electron capture probability is quite sensitive to the projec tile velocity and the ion-sphere radius. The maximum position of the e lectron capture probability is shifted to the target nucleus as the pr ojectile energy increases and is receded from the target nucleus as th e ion-sphere radius increases. It is also found that the maximum value of the capture probability is increased with an increase of the ion-s phere radius. The scaling relationship for the capture cross section i n the screened case and compare with the existing one for the unscreen ed case is also obtained. (C) 1998 American Institute of Physics.