2010/07/28 by P. Hartogh, C. Jarchow, E. Lellouch +62 · 1 citation
Chemistry · Engineering · Physics and Astronomy · #Analytical Chemistry (journal) #Astro and Planetary Science #Atmosphere (unit) #Atomic physics #Chemistry #Hydrogen #Hydrogen chloride #Inorganic chemistry #Mars Exploration Program #Mixing ratio #Optics #Physics #Planetary Science and Exploration #Radiative transfer #Space Exploration and Technology #Thermodynamics #astro-ph.EP
paper · pdf · doi:10.1051/0004-6361/201015160
published as Astron.Astrophys. 521 (2010) L49 · Accepted for publication in Astronomy and Astrophysics (special issue on HIFI first results); minor changes to match published version
arxiv created 2010/07/28 · openalex publication_date 2010/07/28 · arxiv updated 2011/03/07 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report on an initial analysis of <i>Herschel<i/>/HIFI observations of hydrogen chloride (HCl), hydrogen peroxide (H<sub>2<sub/>O<sub>2<sub/>), and molecular oxygen (O<sub>2<sub/>) in the Martian atmosphere performed on 13 and 16 April 2010 (<i>L<i/><sub>s<sub/> ~ 77°). We derived a constant volume mixing ratio of 1400 <i>±<i/> 120 ppm for O<sub>2<sub/> and determined upper limits of 200 ppt for HCl and 2 ppb for H<sub>2<sub/>O<sub>2<sub/>. Radiative transfer model calculations indicate that the vertical profile of O<sub>2<sub/> may not be constant. Photochemical models determine the lowest values of H<sub>2<sub/>O<sub>2<sub/> to be around <i>L<i/><sub>s<sub/> ~ 75° but overestimate the volume mixing ratio compared to our measurements.