X-ray spectrum of a laser-produced iron plasma

Abstract

We present the analysis of the x-ray spectrum between 9.5 and 17.0 Å of a laser-produced iron plasma. Wavelengths and relative intensities for 96 lines are measured. For the strongest part of the spectrum, above 13 Å, almost all of the observed lines are identified as radiation from ${\mathrm{Fe}}^{\mathrm{XVII}}$, ${\mathrm{Fe}}^{\mathrm{XVIII}}$, and ${\mathrm{Fe}}^{\mathrm{XIX}}$ ions. Measurements were made with a curved-crystal spectrograph. Calculations were full intermediate coupling, Hartree-Fock with relativistic corrections. Coulomb-approximation oscillator strengths were used to help in the line identification.