Demonstration of quasiresonant x-ray photoexcitation in a laser-created plasma

Abstract

Resonant photoexcitation in a two-component plasma is demonstrated for the first time in the x-ray range. The 1s-3p resonance line of Al xiii at 6.053 A\r{} is used to pump the 2${\mathit{p}}^{\mathrm{*}}$${(}^{1}$${\mathit{S}}_{0}$)-2${\mathit{p}}^{5}$3d ${(}^{3}$${\mathit{D}}_{1}$) line of Sr xxix at 6.059 \AA{}. Absorption of the aluminum pump line by the strontium plasma is shown unambiguously. The resulting increase in the x-ray fluorescence intensity of the pumped level is measured in a time-resolved experiment.