Abstract

High-resolution grating and Fourier transform spectroscopy measurements, using hollow-cathode and electrodeless discharge lamp sources, have resulted in a list of 92000 lines of U I and U II. The wave-number accuracy is about 0.003 cm<sup>−1</sup>. With this list and new Zeeman structure, isotope-shift, and <sup>233</sup>U hyperfine-structure spectrograms, we have found 500 new U I levels. We now know 1240 even levels between 7020 and 42000 cm<sup>−1</sup> and 360 odd levels up to 38000 cm<sup>−1</sup>. All levels expected to lie below 10000 cm<sup>−1</sup> have been found. Levels of five odd configurations (ƒ<sup>3</sup><i>ds</i><sup>2</sup>, ƒ<sup>3</sup><i>d</i><sup>2</sup><i>s</i>, ƒ<sup>4</sup><i>sp</i>, ƒ<sup>3</sup><i>ds</i>8<i>s</i>, ƒ<sup>4</sup><i>dp</i>) and seven even configurations (ƒ<sup>4</sup><i>s</i><sup>2</sup>, ƒ<sup>2</sup><i>d</i><sup>2</sup><i>s</i><sup>2</sup>, ƒ<sup>3</sup><i>s</i><sup>2</sup><i>p</i>, ƒ<sup>3</sup><i>dsp</i>, ƒ<sup>4</sup><i>ds</i>, ƒ<sup>3</sup><i>d</i><sup>2</sup><i>p</i>, ƒ<sup>3</sup><i>ds</i>8<i>p</i>) are now known.

© 1976 Optical Society of America

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