Line-broadening measurements of ${\mathrm{H}}_{\mathrm{\alpha }}$, ${\mathrm{H}}_{\mathrm{\beta }}$, and ${\mathrm{L}}_{\mathrm{\delta }}$ of C vi in a laser-produced carbon plasma

We measured space- and time-resolved profiles of ${\mathrm{H}}_{\mathrm{\alpha }}$, ${\mathrm{H}}_{\mathrm{\beta }}$, and ${\mathrm{L}}_{\mathrm{\delta }}$ of C v i, in a laser-produced carbon plasma, at the time when the intensity of C v i lines is the highest. Comparing the measured Stark widths of $L_{\delta }$ and $H_{\beta }$ with calculated values which consider the effects of ion dynamics, we inferred an electron density of ${10}^{20}$ ${\mathrm{cm}}^{\mathrm{-}3}$ on target. Using that electron density and recent results for the Stark width of the $H_{\alpha }$ fine-structure components, we fitted an experimental profile of this line to a calculated profile consisting of a superposition of Voigt profiles placed at the positions of the three strongest components. The Gaussian contribution to the profile is a combination of a calculated instrumental width and a Doppler width extrapolated from the measured widths of C v lines in the near ultraviolet. Our results suggest that under conditions similar to those in the x-ray laser experiments, fine-structure splitting, Doppler broadening, and Stark effects are about equally important for $H_{\alpha }$. We also present results from time-integrated spectra that support our time-resolved observations.