Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992acm..proc..657w&link_type=abstract
In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991 p 657-660 (SEE N93-19113 06-90)
Physics
Cometary Atmospheres, Hydrogen, Hydroxyl Radicals, Photodissociation, Photoexcitation, Velocity Distribution, Comets, Extreme Ultraviolet Radiation, Solar Radiation, Water
Scientific paper
The calculated velocity distributions of atomic hydrogen and hydroxyl radicals produced through solar photodissociation of gaseous water molecules are presented. Under collisionless conditions, the calculation was carried out using the most recent available data for the production of H and OH through photodissociation of H2O from its dissociation onset throughout the EUV region. Because the lack of data in certain spectral regions, only upper and lower bounds to the velocity distributions can be obtained. The results show that the H atoms and OH radicals produced exhibit multiple velocity groups. Since most of the current cometary modeling uses a single velocity of 20 km/s associated with the photodissociation of H2O, the present results may be useful in interpreting the many peaks observed in the velocity distributions of cometary atomic hydrogen.
Chen Zhi-Fu
Judge Darrell L.
Wu Chung-Yung Robert
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