Abstract
C 60 films have been irradiated with various fast ions (H, Li, C, O and Si) in the energy range from 0.75 to 6.0 MeV. Structural changes of C 60 molecules were studied by a time-of-flight (TOF) mass spectrometry and Raman spectroscopy. The TOF yields of secondary fullerene ions can be described fairly well by S mod 3 with a modified energy deposition S mod developed in this work. In the Raman study for 1 MeV H + irradiation, it is found that about 40% polymerization is attained at 6×10 15 cm −2 doses and a damage cross-section of 2.5×10 −17 cm 2 is obtained.
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