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The TiII spectrum has been recorded in the region 1100-11 000 Å. 1240 lines have been classified as transitions between 204 levels of the configurations (3d + 4s)3, 3d2 nl (nl = 5, 6s; 4, 5p; 4, 5d; 4f) and 3d4s4p. Parametric studies including configuration interaction have been carried out for a number of configurations. The ionization energy has been determined to 109 494 ± 20 cm-1.

Lifetime measurements using the beam-foil technique have been made for levels in Zn I and Zn II. The following results (in ns) were obtained: ZnI, 4s4p 1P (1.33 ± 0.07), 4s4d 1D (20.5 ± 1.5), 4s4d 3D (5.4 ± 0.6); Zn II, 4p 2P (2.07 ± 0.20), 4d 2D (1.40 ± 0.15), 5s 2S (1.8 ± 0.2), 5p 2P (17 ± 2). These results are compared with previous experimental and theoretical results and the origins of certain disagreements are analyzed.

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We report on large-scale and critically evaluated ab initio multiconfiguration Dirac-Hartree-Fock calculations of the wavelength and transition rate of the "coronal," M1 transition 4f 2 F o 5/2 -2 F o 7/2 in Ag-like ions. The transition between these two fine-structure levels, which makes up the ground term for Z 62 in the isoelectronic sequence, has recently been observed in Yb 23+ and W 27+ , where the latter could be of great importance for fusion plasma diagnostics. We present values for all members of the sequence between Z = 50 and 94, which are supported by excellent agreement with values from recent experiments. The importance of including core-valence correlation with the n = 3 shell in the theoretical model is emphasized. The results show close-to-spectroscopic accuracy for these forbidden lines.