4s^2^1S_0–4S4p ^1P_1 transitions in zinclike ions

The 4s2 1S0–4s4p1P1 transitions of 20 zinclike ions from Ru14+ to Dy36+ were observed in a laser-produced plasma with a 10.7-m grazing-incidence spectrograph. Also, new observations were made of the 3d–4f transitions of Fe15+. Based on the new wavelengths obtained for these Fe transitions and improved wavelengths recently publshed for other Fe ions, revised values were determined for the 4s2 1S0–4s4p1P1 transitions in ten zinclike ions from Ba26+ to W44+ observed by Reader and Luther [ Phys. Rev. Lett.45, 609– 613 ( 1980)] for which a laser-produced spectrum of Fe was used for wavelength calibration.