Solar absorption spectra from two stratospheric balloon flights have been analyzed for the presence of H 2 O 2 and HOCℓ absorption in the 1230.0 to 1255.0 cm −1 region. The data were recorded at 0.02 cm −1 resolution during sunset with the University of Denver interferometer system on October 27, 1978 and March 23, 1981. Selected spectral regions were analyzed with the technique of nonlinear least squares spectral curve fitting. Upper limits of 0.33 ppbv for H 2 O 2 and 0.36 ppbv for HOCℓ near 28 km are derived from the 1978 flight data while upper limits of 0.44 ppbv for H 2 O 2 and 0.43 ppbv for HOCℓ at 29.5 km are obtained from the 1981 flight data.
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Larsen et al. (1985) studied this question.
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