M.T. Bourgeois

The identification of 16O18O16O and 16O16O18O ozone isotopes in high resolution ground-based FTIR spectra

Abstract We present evidence of the 16 O 18 O 16 O and 16 O 16 O 18 ozone isotopes in the μ region from FTIR solar occultation spectra obtained from the Jungfraujoch Solar Observatory (47°N, 8°E, 3580 m) in Switzerland at a spectral resolution of 0.0025 cm -1 (res.=1/2L). These spectra clearly show numerous unblended lines of the 16 O 18 O 16 O ozone isotope. Laboratory spectra in the 5 μ region of both 50 O 3 isotopes have been measured and have yielded line positions of the v 1 + v 3 isotopic bands which can eventually lead to their retrieval from measured ground-based solar occulation spectra. Although retrieval of 16 O 16 O 18 O could be difficult due to slight line blending, identification of several lines is shown.