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Raman studies of ion irradiated samples

By means of Raman spectroscopy the structural evolution of several samples induced by ion irradiation has been monitored. In fact the chemical and physical properties of the targets are deeply modified by the interaction with the ion beam. In particular, carbon dust anologues (), porous silicon (), diamond (), ice mixtures (), and refractory residues (), have been studied. In some cases (,,) laboratory spectra have been compared with available Raman spectra of IDPs (Interplanetary Dust Particles) and meteorites. IDPs and meteorites provide a unique opportunity to study extraterrestrial materials in the laboratory. Different Raman studies have shown that most IDPs exhibit the characteristic amorphous carbon Raman feature and different degrees of order have been recognized in the amorphous carbon phase of IDPs. Laboratory results indicate that these differences could be due to the evolution of IDPs. In particular, amorphous carbon with different degrees of order could be indicative of different irradiation doses by solar wind particles and fast solar protons suffered by IDPs in the interplanetary medium before collection in the Earth's atmosphere.


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Innocenza Busa' 2005-11-14