Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...687.1070r&link_type=abstract
The Astrophysical Journal, Volume 687, Issue 2, pp. 1070-1074.
Astronomy and Astrophysics
Astronomy
9
Ism: Cosmic Rays, Ism: Molecules, Methods: Laboratory, Radiation Mechanisms: Nonthermal
Scientific paper
We studied the compaction of microporous vapor-deposited ice films under irradiation with different ions in the 80-400 keV energy range. We found that porosity decreases exponentially with irradiation fluence, with a mean compaction area per ion that scales linearly with the stopping power of the projectile S above a threshold St=4 eV Å-1. The experiments roughly follow a universal dependence of ion-induced compaction with restricted dose (eV molecule-1). This behavior can be used to extrapolate our results to conditions of the interstellar medium. Relating our results to ionization rates of interstellar H2, we estimate that porous ice mantles on grains in dense molecular clouds are compacted by cosmic rays in ~10-50 million years.
Baragiola Raúl A.
Famá Marcelo
Loeffler Mark J.
Raut Ujjwal
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