Spectroscopic detection of terrestrial deuterium

Details Spectroscopic detection of terrestrial deuterium Spectroscopic detection of terrestrial deuterium

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2115k&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 12, p. 2115-2118

Physics

1

Atmospheric Composition And Structure, Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Evolution Of The Atmosphere, Atmospheric Composition And Structure: Thermosphere-Composition And Chemistry

Scientific paper

Observation of Mars at 1212-1218 Å with the HST Goddard high-resolution spectrograph revealed both Mars' and Earth's D Ly-α lines. The telluric line intensity is 17+/-4R (Rayleighs) at 600 km. We construct a model for H2, H, HD, and D from 85 to 500 km with escape velocities VH and VD as the model parameters. D is formed by photolysis of HDO and in reactions of HD with O, O+, and O(1D). The calculated intensity at solar minimum (F10.7cm=70, T∞=736K) agrees with the measured value for VD=80+/-15cm/s. We applied our model to previous detections of deuterium by means of deuterium absorption cells and ion mass spectrometry. Escapes of H and D are diffusion limited, isotope fractionation factor is 0.88, and deuterium enrichment in the escape processes is ineffective.

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