Space-dependent shift of spectral lines in laser-produced plasmas

Abstract
A space-dependent red-shift of extreme ultraviolet lines of aluminium laser-plasma is observed on a distance covering more than 100, in a single-shot experiment. For radiation coming from highest density plasma, the shift can exceed the broadening of the lines. In the first approximation, this shift does not depend on plasma optical thickness. Various aspects of Stark effect are discussed in order to account for these observations