X-ray absorption spectroscopy using short pulse laser isochoric heated targets

We present a series of experiments to help quantify the effects of density on bounds states in plasmas. The experiments are performed by x-ray back-lighting aero-gel targets heated with an ultrashort pulse laser. The density and temperature is determined by assuming an isothermal expansion and using frequency domain interferometry measure the time-dependent position of the critical surface. Additional temperature verification is made using the target emissivity. The aero-gel target density is systematically increased and absorption spectra is used to monitor the effect of the increased density on the bound states. Preliminary experimental results will be presented.