ANTISCREENING CHANNELS FOR ION-ION COLLISIONAL EXCITATIONS IN LENS PLASMAS

Plasma-screening effects are investigated on antiscreening channels fo r excitation of a one-electron target by a one-electron projectile in dense plasmas. The interaction Hamiltonian in dense plasmas is obtaine d by an appropriate form of the nonspherical Debye-Huckel potentials. Semiclassical straight-line trajectory method is applied to the ion pr ojectile path in order to visualize the antiscreening transition proba bility in dense plasmas as a function of the impact parameter and the collision energy. The plasma screening effects reduce the transition p robabilities, especially, in the dipole-dipole transition. The maximum position of the transition probability is receding from the target nu cleus with increasing projectile energy for the dipole-dipole and dipo le-quadrupole excitations. However, in the quadrupole-quadrupole excit ation, the maximum position is getting closer to the target nucleus wi th increasing projectile energy. The quadrupole transitions (dipole-qu adrupole and quadrupole-quadrupole) show the second maximum which is d ue to the double peaks of the 2s radial distribution function. (C) 199 7 American Institute of Physics.