Spectra and energy levels of sodiumlike ions from Y28+ to Sn39+

Spectra of ten sodiumlike ions from Y28+ to Sn39+ were observed with laser-produced plasmas and grazing- incidence spectrographs. Wavelengths, energy levels, and ionization energies were determined for all ions of the isoelectronic sequence from Y to Sn. Revised ab initio and fitted values are given for the 3d--4f wavelengths of the sodiumlike ions K8+ and Rh34+. Spectra of sodiumlike ions are generally prominent in high-temperature plasmas. They are important for the diagnosis of plasmas found in tokamaks and laser-fusion targets. They are also important for testing the accuracy of ab initio calculations of atomic structures. In this paper we report wavelengths, energy levels, and ionization energies for ions of the sodium isoelectronic sequence from Y28+ to Sn39+