Abstract

High-resolution spectra of a 232ThI4/230ThI4 electrodeless discharge lamp were obtained from 5600 to 36000 cm−1 with a Fourier-transform spectrometer. The splittings of more than 2800 Th i isotopic doublets were measured to an accuracy of 0.001 cm−1. Level isotope shifts were determined for 274 even and 318 odd levels of Th i.

© 1983 Optical Society of America

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