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 6h 2H term. Wavelengths with standard uncertainties varying from ±0.0005 to ±0.0018 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 277 602.8±0.5 cm-1 (34.41837 ±0.00006 eV).

© 1997 Optical Society of America

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