Abstract

The absorption spectrum of B I in the 1350–1900-Å region has been photographed in the third and fourth orders of a 6.6-m spectrograph. The 2<i>s</i><sup>2</sup> 2<i>p</i><sup>2</sup><i>P</i>º-2<i>s</i><sup>2</sup><i>nd</i><sup>2</sup><i>D</i> and 2<i>s</i><sup>2</sup> 2<i>p</i><sup>2</sup><i>P</i>º-2<i>s</i><sup>2</sup><i>ns</i><sup>2</sup><i>S</i> series were observed to n = 39 and n = 10, respectively, leading to the assignment of 35 new term levels in B I. Extrapolation of the <i>nd</i><sup>2</sup><i>D</i> series yields 66 928.0±0.2 cm<sup>-1</sup>, in agreement with the best previously published value for the ionization potential of boron.

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