Composition effects in Stark broadening of hydrogenic lines emitted by heavy ions in inertially confined plasmas

We investigate the dependence of Stark-broadened Lyman-$\beta$ lines emitted by ${\mathrm{Ne}}^{9+}$ and ${\mathrm{Ar}}^{17+}$ in protons, on the composition parameter $p=\frac{C_b}{(C_a+C_b)}$, given in terms of the plasma parameter $\Lambda$, emitter charge $Z_a$, and the relative concentrations $C_{a,b}=\frac{N_{a,b}}{(N_a+N_b)}$. We propose to use the very sensitive $p$ dependence of these lines around $p\sim 1$ to measure small quantities of heavy material contaminating the hydrogenic burn.