Quantum screening effects on orientation phenomena in strongly coupled semiclassical plasmas

The screening and quantum effects on the orientation phenomena (L perpendicular to) for the 1s -> 2p +/- collisional excitations in strongly coupled semiclassical plasmas are investigated. It is found that the 1s -> E2p(-1) transitions are strongly favored in all impact parameter regions. The preference of the 2p(-1) excitation increases with decreasing the thermal de Broglie wave length and decreases with increasing the collision energy. The quantum and screening effects on the orientation parameter are found to be increased with increasing the projectile energy. It is also found that the orientation parameters have minima which correspond to the complete 1s -> 2p(-1) transition since the 1s -> 2p(+1) transition probability is quite small for small impact parameters. (c) 2006 Elsevier B.V. All rights reserved.