Time-resolved x-ray fluorescence of He-like ions in an aluminum-laser-produced plasma

Quasiresonant photoexcitation and nonresonant photoionization of He-like ions in a two-component laser-produced plasma are demonstrated in the x-ray range. The pumping source is the x-ray emission of a high-Z plasma which modifies the populations of the excited states of an aluminum He-like plasma. Fluorescence of the 1s2p-1${\mathit{s}}^2$ line at 7.757 Å has been measured by time-resolved and time-integrated spectral measurements of the two plasma emissions. Photoionization results compare favorably with radiative transfer simulations which calculate the He-like 1s2p-1${\mathit{s}}^2$ line transfer in the photopumped aluminum plasma.