Spectral line shapes in hot plasmas submitted to a strong oscillating electric field have been theoretically studied by applying the standard hypotheses of plasma line broadening together with a nonperturbative Floquet treatment of the external oscillating field. The formulation has been applied to the lines of nonhydrogenic emitters like He-like and Ne-like ions. It is found that the simultaneous action of a strong oscillating field and plasma particle fields can lead to dramatic changes in the spectral emission.

• Received 5 September 2008

DOI:https://doi.org/10.1103/PhysRevA.79.013411