ABSTRACT
On a search for gain on Ni-like 4d-4p lines, we have investigated XUV emission from elongated laser-produced plasmas of Sn and Ag. High resolution spectra were obtained in the 60-220 Å range using a Rowland grazing incidence spectrograph with a 2400 1/mm grating. The (J=0−1) 4d-4p Ni-like line were observed for both elements and the wavelengths were measured at 119.20 ± 0.20 Å for tin and at 139.95 ± 0.15 Å for silver. We find an indication of a small gain (g=0.75 ± 0.6cm−1) on the tin line. Tin spectrum is observed to be dominated by Cu-like lines. This is compatible with the distribution of ionic species predicted by hydrodynamical simulations.
