Abstract
C70 fullerene films deposited on a silicon substrate have been bombarded with He+ ions at 30 keV at room temperature in vacuum. The structural changes undergone by C70 have been followed by both FT‐IR and Raman spectroscopy. The results have been compared to the behavior of C60 fullerene and discussed in an astrochemical context. The main conclusion is that C70, contrary to C60, does not form oligomers at low radiation dose but it is directly and gradually degraded to amorphous carbon (carbon black).
Acknowledgments
Partial financial support of this work from ASI, the Italian Space Agency, Rome, Italy is gratefully acknowledged.