Forbidden transitions in the visible spectra of an electron beam ion trap (EBIT)

Abstract

In an explorative study of visible spectra from an electron beam ion trap (EBIT), a variety of rare-gas ion species has been excited and stored. The spectra reveal several forbidden lines and also show peculiarities of general interest to EBIT users. The lifetime of the 3s23p23P2 level in Si-like Kr22+ has been measured as [(6.3 ±0.3) ms]. The Ml transition 3s23p23P1-3P2 in the Si-like ion Mo28+ has been observed at (284.0 ± 0.2) nm, confirming an identification from tokamak observations by Denne et al. The 3d45D2-5D3 transition in Ti-like Au has been found at (353.2 ±0.2) nm and thus the predicted isoelectronic trend been confirmed. © Physica Scripta 1998.