The 2p44f configuration of fluorine-like silicon, Si VI

The spectrum of five times ionized silicon, Si Vi, has been investigated in the wavelength region 433 to 490 A. The silicon ions were obtained by means oflaser produced plasmas. 52 lines have been identified as belonging to the2p⁴3d-2p⁴4ftransition array. All but two of the 30 levels belonging to the2p⁴4fconfiguration have been found. The uncertainty of the experimentallydetermined level values is less than 5 cm-1, relative to the established levelsin2p⁴2d.The identifications are based on isoelectronic comparisons andsupported by parametric calculations.