Identification of HBr isotopes in the far-infrared stratospheric spectrum

A detailed analysis is reported of high resolution IR theoretical spectra. Identification of spectral lines of HBr isotopes is made for observation conditions in the stratosphere (versus altitude, zenithal angle and concentration). The calculation of spectra suggests that a concentration of HBr higher than 6 pptv is required to detect some spectral lines of this constituent in experimental spectra.