Infrared band intensities of bromine nitrate, BrONO2

Abstract

The integrated band intensities at 296K of gaseous bromine nitrate (BrONO2) in the spectral range 500–2000cm−1 have been measured using Fourier-transform absorption spectroscopy. The absorption spectra were calibrated to absolute absorption cross-sections using the integrated band strength of the ν3 band around 803cm−1 (2.70±0.50×10−17cmmolecule−1) published previously. In this way, integrated band intensities were determined for the first time for the ν1 band around 1709cm−1 (2.43±0.48×10−17cmmolecule−1), the ν2 band around 1286cm−1 (2.99±0.60×10−17cmmolecule−1), the weak ν4/ν8 bands between 720 and 760cm−1 (0.16±0.04×10−17cmmolecule−1) and the ν5 band around 559cm−1 (1.02±0.20×10−17cmmolecule−1). The results are compared with the infrared band strengths of chlorine nitrate and with ab initio calculations.