Use of a laser plasma in determination of a resonance defect of the Lyα1,2 lines of Mg XII and the 2s–3p lines of Ge XXIII

Precision measurements were made of the wavelengths of the satellites of the resonance line of the H-like Mg XII ion as well as of a number of transitions in the Ne-like Ge XXIII ion and their satellites in a plasma created by radiation generated in an Nd-glass laser. The measurements were carried out with a high-resolution, high-luminosity spectrograph containing a mica crystal bent to a spherical surface with a radius R = 100 mm. The absolute wavelength obtained for the 2s²2p^{6 1}S_o–2s2p⁶3p ³P₁ transition in Ge XXIII was λ = 842.08 ± 0.09 pm. The results demonstrated that the short-wavelength component of the Lyman doublet of Mg Xll (λ = 841.92 pm) could be used to pump optically a short-wavelength laser by transitions in the Ge XXIII ion.