ELECTRON-ION COLLISIONAL EXCITATIONS IN STRONGLY COUPLED PLASMAS USING THE ION-SPHERE MODEL

In strongly coupled plasmas, screening effects are investigated on 1s→2p dipole transition probabilities for electron-impact excitation of hydrogenic ions. Electron - ion interaction is described by the ion-sphere model potential. Behavior of the projectile electron is represented by the semiclassical straight-line trajectory method. Variation of the transition probabilities is determined as a function of the plasma-screening strength through the size of the ion sphere. The transition probabilities are increased with an increase of the ion-sphere radius and the projectile energy. These results, in strongly coupled plasmas, are similar to the screening effects on 1s→2p dipole transition probabilities for electron - ion excitations in weakly coupled plasmas described by the classical Debye-Hückel model. © 1995 American Institute of Physics.