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Natural-linewidth measurements of the

3 C

and

3 D

soft-x-ray transitions in Ni xix

https://doi.org/10.1103/PhysRevA.109.063108

Shah, Chintan; Kühn, Steffen; Bernitt, Sonja; Steinbrügge, René; Togawa, Moto; Berger, Lukas; Buck, Jens; Hoesch, Moritz; Seltmann, Jörn; Kozlov, Mikhail G; et al (June 2024, Physical Review A)

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 neonlike

Ni

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

3 C

and

3 D

, 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. Published by the American Physical Society2024

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