Abstract

The <i>n</i>ƒ <sup>2</sup><i>F</i> series (<i>n</i>=4-11) of B I is found from combinations with 3<i>d</i> <sup>2</sup><i>D</i> and 2<i>s</i>2<i>p</i><sup>2</sup> <sup>2</sup><i>D</i>, and the series limit is derived by means of a Ritz formula, yielding an ionization potential of 66 928.10±0.1 cm<sup>-1</sup>. The same value applies to both <sup>10</sup>B and <sup>11</sup>B because the isotope shift of the ground state is shown to be zero. From the resolved structure of the transition 2<i>s</i>2<i>p</i><sup>2</sup> <sup>2</sup><i>D</i>-4ƒ<sup>2</sup><i>F</i> at 8212 Å, we derive for 2<i>s</i>2<i>p</i><sup>2</sup> <sub>2</sub><i>D</i> a fine-structure interval of -0.31 cm<sup>-1</sup> and an isotope shift of -0.58 cm<sup>-1</sup>, corresponding to a specific mass shift of -0.67 cm<sup>-1</sup>.

© 1970 Optical Society of America

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