Infrared Emission Spectra of Gaseous B2O3 and B2O2

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Abstract
The infrared emission spectra of gaseous B2O3 and B2O2 in the temperature range 1400–1800°K have been studied in the region 700–4000 cm—1. Distinct bands were found for natural B2O3 at 2040, 1302, and 742 cm—1, and the B10–B11 isotope shifts measured. From the isotope shift data and other considerations the B2O3 molecule has been assigned a V structure having C2v symmetry. A force constant analysis has been made and a frequency assignment is given from which thermal functions have been computed. The calculated force constants are consistent with the high stability of the molecule. Only one emission band of gaseous B2O2, at 1890 cm—1, has been observed. A linear D∞h structure was assumed and a frequency assignment and thermal functions estimated.
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