Investigation of theHαline in dense plasmas

Abstract

The $H\alpha$ line is analyzed in a dense plasma of $N_e\approx {10}^{18}$ ${\mathrm{cm}}^{-3\mathrm{}}$ produced in a $z$-pinch discharge. The line is shifted by up to 9 Å to the red, and the profile is strongly modulated. This modulation is attributed to the effect of collective fields of different frequency distributions, one being of the order of ${\omega }_{\mathrm{pi}}$. The shift is density dependent and agrees with available theoretical calculations.