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 projectiles using the classical Bohr-Lindhard model. The interaction potential in strongly coupled plasmas is described by the ion-sphere model potential. The electron capture radius is obtained by the ion-sphere interaction potential and the kinetic energy of the released electron in the 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 impact parameter, projectile energy, and ion-sphere radius. It is found that the electron capture probability is quite sensitive to the projectile velocity and the ion-sphere radius. The maximum position of the electron capture probability is shifted to the target nucleus as the projectile energy increases and is receded from the target nucleus as the ion-sphere radius increases. It is also found that the maximum value of the capture probability is increased with an increase of the ion-sphere radius. The scaling relationship for the capture cross section in the screened case and compare with the existing one for the unscreened case is also obtained. (C) 1998 American Institute of Physics.