Spectra of multicharged ions have been analyzed for all stable elements in the period from Z = 37 (Rb) to Z = 50 (Sn), in the region of n = 4, Δn = 0 transitions. The transition arrays (4s2 + 4p2 + 4s4d)-4s4p, 4s4f and 3d94s, 3d94d-3d94p have been identified in zinc-like and nickel-like ions respectively, with the help of the ab initio relativistic parametric potential method and of the Slater-Condon method with generalized least-squares fits of energy parameters.

square error of wavelength determination is estimated as Laser produced spectra of iron, cobalt and nickel were obtained using the 6.65 m normal incidence vacuum spectrograph with a short-wave blazed 1200 lines/mmgrating. Transitions between the configurations 3 s 2 , 3s3p, 3 p 2 , 3s3d and 3 p 3d of the Mg-like ions FeXV, CoXVI and NiXVII were studied in the region 170-600 A. Singlet-triplet connections were found for these ions. The previous identifications were revised and 60 new lines, mainly from the 3p 3d configuration, were found. Wavelengths were remeasured and related energy levels were improved. New identifications of solar flare lines are proposed on the basis of this work.

We have undertaken a number of experimental studies of the structure of singly ionized boron, B II. Much of this work was initially motivated by a search for the "missing" 2s3s 1 S term. There was a surprising disagreement between theory and experiment for this level. In this context lots of data for B II were collected over the years, from beam-foil experiments, high-resolution spark spectroscopy and theoretical calculations. The new material, which includes more than 80 newly classified (or revised) spectral lines, has now been thoroughly analyzed. This was followed by a critical compilation of all known levels and lines of B II, along with the theoretical interpretation of the levels, classifications of the lines and calculated transition probabilities for most lines. C Physica Scripta 2005 Physica Scripta 71 A. N. Ryabtsev et al. 3. The beam-foil experiment of 1999 and some earlier unpublished beam-foil studies

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