Can cosmic rays amorphize silicate dust particles?

Details Can cosmic rays amorphize silicate dust particles? Can cosmic rays amorphize silicate dust particles?

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh51d0297b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH51D-0297

Astronomy and Astrophysics

Astronomy

2104 Cosmic Rays

Scientific paper

Interstellar and interplanetary dust plays a key role in the evolution of the Interstellar Medium (ISM) in galaxies and the formation of stars, planets and possibly life. The dust composition is determined by physical processes, including ion bombardment. We have irradiated forsterite single crystals dust analogs with swift heavy ions with a large electronic energy deposition. Amorphization of the crystals was monitored with Rutherford Back-Scattering (RBS) and verified by transmission electron microscopy (TEM) observations. Modeling of ion tracks also shows a similar behavior. IR spectra of the irradiated samples agree well with observed astronomical spectra. Based on this evidence, and taking into account accepted ion fluxes we can predict that silicate grains can be amorphized by heavy cosmic rays.

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