Physics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990crsw.book.....h&link_type=abstract
Chemische Reaktionen suprathermischer Wasserstoffatome in der Koma von Kometen., by Heyl, M.. Forschungszentrum Jülich GmbH (Ge
Physics
1
Scientific paper
Photodissociation of H2O molecules in cometary comae creates suprathermal hydrogen atoms with kinetic energies in the eV range. Spatial and energy distribution of the hot hydrogens in the coma are calculated by two models: a) the vector model of Festou, based on a linear expansion of hydrogen, and b) a Monte-Carlo simulation which accounts for changes in direction and velocity due to collisions. The results obtained via the two independent approaches on the basis of data for P/Halley differ by only 20%. For further calculations, the vector model lends itself to describe the distribution of energetic atoms in the coma in a simple and effective way. A density maximum of hot H atoms is observed at distances from the nucleus of 100 to about 1000 km. In this region the H-abstraction for H2O amounts to about 15%, for CH4 to 40%, and for OH to max. 60% of the respective photodissociation rate. In particular, the production of CH3 radical by H-abstraction is by a factor of 3 higher than that by photodissociation.
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