“…Both instruments observe simultaneously the same air mass, and together they yield an extensive set of stratospheric constituents that can be used for detailed analysis of atmospheric chemical models, such as ozone destruction cycles. In particular, the 480-650 GHz TELIS channel is able to measure vertical profiles of ClO, BrO, O 3 and its rare isotopologues, O 2 , HCl, HOCl, H 2 O and three rare isotopologues, HO 2 , NO, N 2 O, NO 2 , HNO 3 , CH 3 Cl, and HCN. In this paper the design and technology for the 480-650 GHz channel as used in the flight configuration are presented in conjunction with test results and the first preliminary scientific results.…”