Intercombination transition rates in Al-like $\mathsf{Au^{66+}}$ ions

Relativistic multireference many-body perturbation theory calculations on F-, Ne-, Na-, Mg-, Al-, Si- and P-like xenon ions

“…Bengtsson et al [62] have declared that suggestion to be anyway grossly wrong, based on their isoelectronic studies that showed a trend which, however, itself deviated noticeably from the well-established trend at lower nuclear charges [59]. When this inconsistency was pointed out [63], Ishikawa and Vilkas [64] performed new calculations which indicated that probably everybody had been not quite right on these transitions in high-Z Si-like ions (Xe and Au [8,9]) so far. Another later calculation [65] has wavelength results near to the same isoelectronic trend, but it does not mention any corrections for radiative effects.…”

“…The experimental set-up of the beam-foil work on Xe and Au at the Darmstadt (Germany) GSI UNILAC accelerator has been described elsewhere [7][8][9]. This experimental arrangement has gone through various development stages; most of the experimental effort was directed at the precision spectroscopy of few-electron ions, in particular the determination of QED contributions to the transition energies of n = 2-2 transitions in Li-and Be-like ions [34][35][36][37][38].…”

“…We resort to experimental data for atomic systems well beyond the bulk of well-analysed spectra, and thus with some uncertainty in the earlier line classifications. The data are from a series of beam-foil experiments on Xe and Au [7][8][9] that have, about a decade ago, pushed the envelope of such enterprises. (One of us, ET, was the lead author of those three studies, and some of the laboratory notes and other unpublished materials of the time are available to us for a re-investigation.)…”

Critical Assessment of Theoretical Calculations of Atomic Structure and Transition Probabilities: An Experimenter’s View

“…Fewer lines in the spectrum avoid many problems of line blends and position determination, but one often needs collisional-radiative modeling computations to ascertain which lines should be seen and which ones should not appear. The difference can be drastic (see and compare [34,192,197,278]). The difference also appears in astrophysical data.…”

“…With increasing nuclear charge, the fine structure splitting drives the lines apart, but some of them remain close enough to each other to fall into a wavelength range covered by a single position sensitive detector. In this way the lines have been followed in beam-foil spectra up to Z = 79 (Au), and some of the lifetimes have been measured [197]. For the Al isoelectronic sequence, the high-Z trend of Huang's MCDF computations was found closer to experiment than similar computations for the other isoelectronic sequences done in the same period.…”