Measurements of line overlap for resonant spoiling of x-ray lasing transitions

摘要

High-precision measurements are presented of candidate line pairs for resonant spoiling of x-ray lasing transitions in the nickel-like W(sup 46+), the neon-like Fe(sup 16+), and the neon-like La(sup 47+) x-ray lasers. Our measurements were carried out with high-resolution crystal spectrometers, and a typical precision of 20--50 ppM was achieved. While most resonances appear insufficient for effective photo-spoiling, two resonance pairs are identified that provide a good overlap. These are the 4p(sub 1/2) --> 3d(sub 3/2) transition in nickel-like W(sup 46+) with the 2p(sub 3/2) --> 1s(sub 1/2) transition in hydrogenic Al(sup 12+), and the 3s(sub 1/2) --> 2p(sub 3/2) transition in neon-like La(sup 47+) with the 1(sup 1)S(sub 0)-2(sup 1)P(sub 1) line in heliumlike Ti(sup 20+).