Beam-Foil Spectra of Highly Charged Neon Ion in Visible Region

Abstract

Highly charged neon ions were studied by the beam foil method in the visible region. The lines due to transitions of 2s7l-2s8l' in berylliumlike Ne VII were found to be split into l-components by the perturbation of the nearby lying multiply excited 2p5l levels to the 2s8l [1]. In the present work the decay was measured by the beam-foil time-of-flight technique. The transitions 2s7i–2s8k (388.48 nm) and 2s7h–2s8h (386.34 nm) show a very slow decay with multiexponential features due to the heavy cascading. The remaining transitions with lower l decay faster depending upon the admixture with 2p5l states. The observed multiexponential decay of 2s7i–2s8k was well reproduced on the basis of the excitation model according to σ(n) ∝ n−3 and σ(l) ∝ 2l + 1.