Abstract
Fourteen new spectral lines of Zr iv lying between 3200 and 4600 Å were observed with a sliding spark discharge and a 10.7-m normal-incidence spectrograph. The lines were classified as transitions between highly excited energy levels of this ion. The measured wavelengths provide improved values for the known energy levels as well as a value for the previously unknown term. Wavelengths with standard uncertainties varying from to Å were determined from the optimized level values for a group of lines between 445 and 1291 Å. An improved ionization energy was determined as
© 1997 Optical Society of America
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