Infrared band intensities of bromine nitrate, BrONO2

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