ABSTRACT

A space-resolved spectrum of Mg laser plasma in a range of 180 A is obtained using an ultrahigh-resolution spectrograph comprising two normal-incidence multilayer mirrors and a plane grating at grazing incidence. Line profiles of the 3s-3p transition array of MglV are analyzed vs distance to the target surface. The distance-dependent asymmetric lineshapes are attributed to the combined effect of collisional broadening and Stark shift of the 3 s levels due to electric plasma microfields. The lineshapes are interpreted in terms of electron density vs distance to the target.