XUV spectral analysis of ns- and ps-laser produced platinum plasmas.

XUV spectra of ns- and ps-laser produced platinum (Pt) plasmas in the 1–7 nm wavelength region, where Δn = 1 n = 4–5 and Δn = 0 n = 4-4 transitions dominate the observed emission, were investigated experimentally and theoretically. Ab initio calculations using the Hartree–Fock with configuration interaction (HFCI) Cowan suite of codes and the unresolved transition array (UTA) formalism, as well as consideration of previous predictions of isoelectronic trends, together with spectra obtained under different laser power densities are all employed to identify lines and a number of new features in spectra from Pt XX to Pt XLII. The possible reasons for the main differences between the ns- and ps-laser plasmas spectra are also demonstrated. This work extends previous analyses of the XUV spectra of laser produced gold, tungsten, tantalum, hafnium and rhenium plasmas in the 1–7 nm wavelength range. [ABSTRACT FROM AUTHOR]