INFRARED AND MICROWAVE-SPECTRA OF SRO AND BAO

The high-resolution infrared spectrum of strontium oxide has been observed in a low-pressure flame. A total of 43 Δv = 1 transitions has been measured for the three most abundant isotopomers of SrO. New microwave measurements have also been made for SrO and BaO using a laser ablation technique. The measurements were combined in a least-squares fit with other data taken from the literature to obtain a set of Dunham potential constants and Dunham rovibrational coefficients. The accurate values obtained for the first terms in the Dunham potential function enabled us to calculate several higher-order rovibrational constants that could not be determined from a direct fit to the experimental data. Constants, determined in a parallel fashion, are given for SrO, BaO, CaO, and MgO. The nuclear quadrupole coupling constants have been determined for 87SrO, v = 0, 1, and 2, and for v = 0 of 135BaO and 137BaO. © 1992.