Abstract

The structure of about 40 low-energy levels of singly ionized thulium is given. The twenty 4ƒ<sup>12</sup>(<sup>3</sup><i>H</i><sub>6</sub>)5<i>d</i>6<i>s</i> levels are interpreted in <i>J</i><sub>I</sub><i>J</i><sub>II</sub> and <i>J</i><sub>I</sub><i>L</i><sub>II</sub>, coupling schemes, and the twelve 4ƒ<sup>12</sup>(<sup>3</sup><i>H</i><sub>6</sub>)6<i>s</i>6<i>p</i> and six of the 4ƒ<sup>13</sup>6<i>p</i> levels are given <i>J</i><sub>I</sub><i>J</i><sub>II</sub> designations. The first three levels of 4ƒ<sup>12</sup>6<i>s</i><sup>2</sup> are established. The intensity relations of the transitions connecting some of the levels are discussed. The following values for the interaction parameters are obtained directly from these levels: ζ<sub>ƒ</sub>=2506 cm<sup>-1</sup> ζ<sub><i>d</i></sub>=1213 cm<sup>-1</sup> ζ<sub><i>p</i></sub>=2111 cm<sup>-1</sup> (from 4ƒ<sup>13</sup>6<i>p</i>) ζ<sub><i>p</i></sub>=3467 cm<sup>-1</sup> (from 4ƒ<sup>12</sup>6<i>s</i>6<i>p</i>) <i>G</i><sub>ƒ<i>s</i></sub>= 212 cm<sup>-1</sup><i>G<sub>ds</sub></i>=1535 cm<sup>-1</sup><i>G<sup>ps</sup></i>=2613 cm<sup>-1</sup> More than 200 lines are classified.

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