Soft x-ray lasing in neonlike germanium and copper plasmas

Soft x-ray 3p\ensuremath{\rightarrow}3s lasing in neonlike germanium (${\mathrm{Ge}}^{22+}$) and copper (${\mathrm{Cu}}^{19+}$) in the wavelength interval of 195 to 285 A\r{} is observed for the first time, with gain coefficients ranging from 1.7 to 4.1 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, th... View More