Improving the dicenter model for hot dense plasmas: molecular stark effect
Résumé
In previous work of the dicenter model, used to take into account the ionic correlation effects in hot dense plasmas, only considered a single perturbing ion (i.e., the nearest neighbor ion) thus limiting its range of applicability. The improvement proposed in the present work includes the effect of all perturbing ions through a quasistatic external microfield acting on a ``quasi-molecule''. This enlarges the domain of validity of the dicenter model. For low densities this new alternative model gives line widths in agreement with standard ``monocenter'' profiles without artificially reducing the electron screening inside the dicenter emitting cell. This reduced screening, which had been employed to treat the repulsive interactions between the quasi-molecule and the other perturbing ions, is removed in the present work. (C) 2001 Elsevier Science Ltd. All rights reserved.