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We present observations of VUV transitions between doubly excited sextetstates in O IV, F V and Ne VI. Spectra were produced by collisions of an O+beam with a solid carbon target. We also studied spectra obtained previously ofF V and Ne VI. Some observed lines were assigned to the 1s2s2p23d 6L - 1s2p33d6D, L=F, D, P electric-dipole transitions, and compared with results of MCHF(with QED and higher-order corrections) and MCDF calculations. 42 new lineshave been identified. Highly excited sextet states in five-electron ionsprovide a new form of energy storage and are possible candidates for VUV andx-ray lasers.Comment: 11 pages, 12 figure

1s2s2p23p6L–1s2p33p6P transitions in O IV, F V and Ne VI

1s2s2p²3p⁶L–1s2p³3p⁶P transitions in O IV, F V and Ne VI