MEASUREMENT OF THE LY-ALPHA MG RESONANCE WITH THE 2S-]3P NE-LIKE GE LINE

Measurements and calculations of the resonance between the Ly-alpha li ne of magnesium and the 2s --> 3p transition in neonlike germanium are presented. This resonance is of possible use as part of a resonantly photo-pumped x-ray laser scheme recently proposed which would lase on several 2p --> 2s transition between 64 and 89 angstrom in neonlike ge rmanium. Measurements of the resonance are made by three different app roaches: one using the electron beam ion trap, the second using laser- produced plasma, and the third on a tokamak. These results are compare d with calculations and other measurements. Certain discrepancies are observed with previous measurements which may be due to the partial ov erlap between oxygenlike and neonlike lines in germanium. The results do show a good resonance between magnesium and germanium, with the ger manium line between the two Ly-alpha components of magnesium but neare r to the short-wavelength component.