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Computer Calculation of Collision Cascades by Energetic Particles Penetrating Dust Grains

Published online by Cambridge University Press:  12 April 2016

K. Rössler  and
G. Eich
K. Rössler
Affiliation:
Institut für Chemie 1 (Nuklearchemie) der Kernforschungsanlage Jülich GmbH, Postfach 1913 D-5170 Jülich, Federal Republic of Germany
G. Eich
Affiliation:
Institut für Chemie 1 (Nuklearchemie) der Kernforschungsanlage Jülich GmbH, Postfach 1913 D-5170 Jülich, Federal Republic of Germany

Abstract

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The penetration of energetic particles from stellar winds, cosmic rays and fast moving gas clouds in interstellar dust grains induces a variety of physical and chemical changes. Detailed information on penetration ranges, number of secondary projectiles produced by knock-on and their energy distribution is obtained from computer simulation of collision cascades with the program MARLOWE. Model targets are polycrystalline H2O-ice, NH4Cl, and SiO2, projectiles are lo2 - lo4 eV H, He, and C. Depending on the energy and the projectile/ target mass ratio up to lo2 secondary projectiles are created per primary impact with energies ranging from a few to some lo3 eV. In composite grains, condensed gases and ice mixtures the energetic secondaries can undergo hot chemical reactions leading to a series of precursors for larger organic and biomolecules.

Type
VI. Dust – Plasma Interactions
Information
International Astronomical Union Colloquium , Volume 85: Properties and Interactions of Interplanetary Dust , 1985 , pp. 351 - 356
Copyright
Copyright © Reidel 1985

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