Fourier Transform Spectroscopy of the B²Σ-X²Σ Transition of BaH

Abstract

The B 2 Σ- X 2 Σ band system of gaseous barium hydride in the wave length region 8900-11200 Å has been examined in absorption using a King furnace. The spectrum has been obtained by means of Fourier transform spectroscopy. Seven bands have been rotationally analyzed. Term values and molecular constants of the B 2 Σ and X 2 Σ states have been determined by standard least-squares analysis. The following molecular constants have been derived (cm -1 ): T e ω e ω e x e ω e y e B e α e 10 4 × D e B 2 Σ + 11092.593 1088.898 15.471 0.0237 3.26879 0.07061 1.1585 X 2 Σ + 0. 1168.433 14.611 0.0276 3.38226 0.06568 1.1234