Measurements of H2O2/+/ in the D-region and implications for mesospheric H2O2

Computer Science – Sound

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Atmospheric Composition, D Region, Hydrogen Peroxide, Ionospheric Ion Density, Mesosphere, Rocket Sounding, Atmospheric Chemistry, Density Distribution, Mass Spectroscopy, Rocket-Borne Instruments, Vertical Distribution

Scientific paper

Discussion of a minor positive ion with mass 34 amu repeatedly observed in the ionospheric D-region above 75 km by rocket-borne mass spectrometers. The ion 34(+) has been interpreted as 34-S(+) in the altitude region from 75 to 85 km, where the measured 34(+)/32(+) abundance ratio was close to that of the sulfur isotopes. However, this interpretation is questionable, because S(+) ions are rapidly lost by ion-molecule reactions particularly with O2. On the basis of measurements of the ion 34(+) in three rocket-borne mass-spectrometer experiments during distrubed conditions, it is regarded as more likely that the ion 34(+) is H2O2(+) produced from mesospheric H2O2 by charge transfer with O2(+).

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