Quest for experimental M1 and E1-intercombination transition probabilities in few-electron Xe ions

Abstract

The experimental access to M 1 transition probabilities within the nsanp ~ (1 =<k < 5) ground state configurations of highly ionized atoms is outlined. A test experiment on Xe( 45 -50)+ yielded first spectra and decay curves of the 2s 2 ISo-2s2p3p° intercombination transition in Xe 5°+ and of M 1 transitions within the 2s22p k (1 __< k =< 5) ground configurations. The data compare well only with theoretical predictions which take the Lamb shift into account, Problems and prospects for better measurements are discussed.

Spectroscopy of berylliumlike xenon ions using dielectronic recombination

“…-group. Table 2 compares the present intra-L-shell excitation energies with other experimental [9,11,12,[27][28][29] and theoretical [2][3][4][5][6][7][8] results. The comparison is also summarized in figure 5.…”

“…Year Method 2s 2 1 S 0 2s 2 1 S 0 2s 2 1 S 0 2s 2p 3 P 0 −2s2p 3 P 1 −2s2p 3 P 2 −2s2p 1 P 1 −2p [11] 1992 beam-foil 127.3(3) --Möller et al [27] 1991 beam-foil 126.6(5) --Träbert et al [28] 1990 beam-foil 126.6(5) --Möller et al [29] 1989 beam-foil 126.39(64) -- proper theoretical description of this two-valence-electron system and the associated strong electron-electron interaction. The same holds true for the other excitations.…”

Extreme ultraviolet spectra of highly charged Xe ions

“…The beam-foil study by Möller et al ͓30,31͔ comprised no wavelength calibration effort and instead relied on predicted wavelength values to find the line, and then measured the decay rate of the upper level. Feili et al ͓19͔ also observed the line, but opted not to present it in that publication, because in the stationary calibration light source they had no good reference lines that would frame this particular line.…”