High resolution spectroscopy of prompt and metastable decaying levels in highly ionized argon, especially of the metastable3 P 2-state of Ar16+ and the4 P 5/2-state of Ar15+

Abstract

Besides the prompt x-ray emission of Ar-ions, the metastable decay of the heliumlike 3P 2-and the lithiumlike 4Ps/z-levels of highly ionized Ar 16+ and Ar is+ atoms has been observed in a foil-excited beam using a flat-crystal spectrometer. Due to the high x-ray energy resolution of the spectrometer the two 3P 2 ~ IS o and 4P5/2 ---, 2S1/2 transitions could be resolved. The experiment yielded (3128+2)eV for the 3P 2 ~ IS o and (3091 _+2)eV for the 4P5/2~2S~/2 transition energy respectively. Using a time of flight technique the lifetimes of the aP 2-and the 4Ps/2-states were determined to be (1.44 + 0.09) ns and (0.66 _+ 0.05) ns.

Lifetime measurements of the3 P 2 and4 P 5 2/0 states in He- and Li-like titanium and chromium

“…Using the time-of-flight technique decay curves were measured. The experimental set-up of the x-ray and electron spectrometer was similar to that described in previous papers [5,8]. In the x-ray spectrometer a LiF (220)-crystal with a 2d-spacing of 2.848 A and a 0.1 ~ Soller collimator were used giving a spectral resolution 2/A2 of about 1,200 for the Ti K-x rays.…”

Reference-free measurements of the1s2s2p2P1/2,3/2o→Machado1, Bian2, Paul3 et al. 2020Phys. Rev. A141130View full textAdd to dashboardCite

“…There is only one measurement for Z > 28, performed on the Livermore EBIT for the q line of praseodymium (Z = 59) [53]. For the 1s2s2p 4 P 5/2 → 1s 2 2s 2 S 1/2 transition, its energy has been measured only in Ar [47,54].…”

The Allure of High Total Angular Momentum Levels in Multiply-Excited Ions

“…Following the example of S. Mannervik [13] (an article recommended for a review of techniques and problems not covered in the present text), I concentrate my report on photon transitions, many of which compete with Auger decays. Most of the doubly excited three-electron levels are very short-lived, but one of them stands out in slightly "delayed" satellite spectra and thus yields access to a "forbidden" decay mode [18]. That level is the very 1s2s2p 4 P o 5/2 level which in Gabriel's treatise and tables is not even mentioned, but which has since been studied for a number of elements for the isoelectronic Z-scaling of the M2 transition rate.…”