Highly excited and autoionizing states in the spectrum of triply ionized titanium Ti(IV)

The spectrum of Ti(IV) excited in a vacuum spark was investigated in the range 250–900 Å with high resolution. Eighty-four lines were measured and identified as transitions from the 3p⁶ns, 3p⁶np, and 3p⁶nf configurations, where n ≤ 8, ≤ 10, and ≤ 8, respectively, and from the 3p⁵3d² and 3p⁵3d⁴s configurations. The lines due to the transitions from the autoionizing levels of the 3p⁵3d² and 3p⁵3d⁴s configurations were also observed and their widths were measured. The experimental data were compared with the results obtained by calculations using the Hartree-Fock method and semiempirical calculations.