Abstract
The thermal emission at high temperature (1100 °C) of BaLi has been analyzed spectroscopically at high resolution with a Fourier transform spectrometer. Molecular emission in the infrared region is observed and is ascribed to a transition from the (2)2Π state towards the ground state X 2Σ+ of BaLi. These states (among several others) have been predicted from ab initio calculations [see part I, A. R. Allouche and M. Aubert-Frécon, J. Chem. Phys. 100, 938 (1994)]. Very good agreement is observed between theoretical predictions and experiment for the energy of the (2)2Π state and spectroscopic constants of both states. Both isotopic species Ba7Li and Ba6Li have been investigated and molecular parameters are derived from the analysis of the (2)2Π→X 2Σ+(0,0) band (the one analyzable band). No irregularities appear in the rotational structure.
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