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Free keywords:
Atom & ion trapping & guiding, Configuration interaction, Plasma diagnostic techniques, X-ray emission spectroscopy, Stellar plasmas, Synchrotron radiation & free-electron lasers, Trapped ions, Laboratory studies of space & astrophysical plasmas, Lifetimes & widths, Oscillator strength, Plasma opacity, X ray astronomy
Abstract:
We used the monochromatic soft-x-ray beamline P04 at the synchrotron-radiation facility PETRA III to resonantly excite the strongest 2p-3d transitions in neonlike Ni XIX ions, [2p6 ]J=0 → [(2p5 )1/2 3d3/2 ]J=1 and [2p6 ]J=0 → [(2p5 )3/2 3d5/2 ]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 (3C)/ f (3D) = 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.
