Characteristics of the decay of quartet states in the isoelectronic sequence Li-Ne+7

Collision Spectroscopy of Quartet and Doublet Transitions in doubly excited Ne7+

“…However, this transition has been measured at in 243.8 Ó N V in spite of the small probability 2.4 ] 108 s~1 [23]. In Table I, the measured wavelengths of these lines are compared to nonrelativistic variational calculations of Zelichenko and Leonov [19].…”

“…Beam-foil spectroscopy of 3dÈ4f transitions between doubly excited terms of Ne VIII has been done by Buchet-Poulizac et al [18]. Surprisingly enough, theoretical studies of doubly excited states of Ne7`are also very scarce [17,19] although a number of papers were devoted to many ions of the sequence. Therefore, we performed an experiment to determine a larger number of levels, to reconstruct a sufficiently complete pattern of the quartet system of Ne VIII and, possibly, to observe some transitions between doubly excited states in the doublet term system.…”

Low-lying quartet states in Li-like neon

“…The theoretical lifetimes were calculated considering only doubly excited configurations; autoionization and transitions to singly excited states were not considered. In addition, we include in this table non-relativistic calculations from Zelichenko and Leonov [22]. Those not measured were too weak.…”

“…Those not measured were too weak. a Non-relativistic variational calculations from Zelichenko and Leonov [22].…”

“…Nevertheless, studies of the transitions from the low-lying states in Li-like neon are still scarce [18][19][20], although Rydberg ISEQUAS in UV and visible beam-foil spectra have been recently reported [21]. Whereas transition wavelength calculations already exist [22], systematic studies to be published have been undertaken only for transitions Ne VIII 1s2l3d 4 L-1s2l4f 4 (L + 1); l = s, p [23]. This shortage is revealed by Kramida and Ivanov [24] in a critical compilation of inner-shell excited energy levels in Li-like Ne.…”