Abstract
The spectrum of zinc was photographed in the 200-500 Å wavelength region on a 6.65 m grazing incidence spectrograph using a sliding spark and a triggered spark as light sources. On the basis of these measurements the 3d9-3d8np (n = 4, 5, 6) + nf (n = 4, 5) transitions of Zn IV have been studied. The earlier analysis of the 3d84p configuration has been confirmed and extended. Thirty-six (36) levels of the 3d85p, 15 of the 3d76p, 44 levels of the 3d84f and 28 levels of the 3d85f configurations have been established. Least-squares-fit energy level calculations confirm the analysis. From the levels of the 3d8np (n = 4 → 6) and 3d8nf (n = 4, 5) configurations, the ionization potential has been calculated as Zn V 3F4 = 480 490 cm-1 (59.56 eV). One hundred eighty-one (181) lines have been classified in the Zn IV spectrum in the 225-500 Å region, in this region are classified fifty (50) lines in the 3d8-3d74p transition array of Zn I.
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