paper

Natural-linewidth measurements of the 3C and 3D soft-x-ray transitions in Ni XIX

arXiv:2404.14589 · doi:10.1103/PhysRevA.109.063108

Abstract

We used the monochromatic soft-x-ray beamline P04 at the synchrotron-radiation facility PETRA III to resonantly excite the strongest $2 p - 3 d$ transitions in neon-like Ni XIX ions, $[2 p^{6}]_{J = 0} \to [(2 p^{5})_{1/2} 3 d_{3/2}]_{J = 1}$ and $[2 p^{6}]_{J = 0} \to [(2 p^{5})_{3/2} 3 d_{5/2}]_{J = 1}$ , respectively dubbed 3C and 3D, achieving a resolving power of 15\,000 and signal-to-background ratio of 30. We obtain their natural linewidths, with an accuracy of better than 10\%, as well as the oscillator-strength ratio $f (3 C) / f (3 D)$ = 2.51(11) from analysis of the resonant fluorescence spectra. These results agree with those of previous experiments, earlier predictions, and our own advanced calculations.

10 pages, 3 figures, 3 tables, published