Abstract

A theoretical analysis of the Eu I spectrum has been attempted with the use of available experimental data. Energy matrices including both electrostatic and spin—orbit interactions were constructed and, wherever possible, Slater parameters giving a best fit to the observed levels have been derived. The positions reported for terms below about 40 000 cm<sup>-1</sup> arising from the addition of two electrons to the <sup>8</sup><i>S</i><sub>7/2</sub> ground state of the 4ƒ<sup>7</sup> core are critically examined. The analysis confirms the identifications previously given to terms below 32 000 cm<sup>-1</sup> but reveals a number of discrepancies in the assignments of levels to higher terms. Tables of observed and computed wavenumbers, eigenvectors, and theoretical <i>g<sub>J</sub></i> values are presented for the configurations 4ƒ<sup>7</sup>(<sup>8</sup><i>S</i>)6<i>s</i>6<i>p</i>, 4ƒ<sup>7</sup>(<sup>8</sup><i>S</i>)6<i>s</i>5<i>d</i>, and 4ƒ<sup>7</sup>(<sup>8</sup><i>S</i>)5<i>d</i>6<i>p</i>. The configurations 4ƒ<sup>7</sup>(<sup>8</sup><i>S</i>)6<i>s</i>7<i>s</i>, 4ƒ<sup>7</sup>(<sup>8</sup><i>S</i>)6<i>s</i>8<i>s</i>, 4ƒ<sup>7</sup>(<sup>8</sup><i>S</i>)6<i>s</i>7<i>p</i>, 4ƒ<sup>7</sup>(<sup>8</sup><i>S</i>)6<i>s</i>5ƒ, 4ƒ<sup>7</sup>(<sup>8</sup><i>S</i>)5<i>d</i><sup>2</sup>, and 4ƒ<sup>7</sup>(<sup>8</sup><i>S</i>)6<i>s</i>6<i>d</i> are also discussed, together with the likely influence of configuration interaction. The analysis indicates the need for further experimental work before an understanding of these latter configurations can be achieved.

© 1965 Optical Society of America

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