Ionization and Multifragmentation ofC60by High-Energy, Highly Charged Xe Ions

Swift heavy ion induced modification of C60 thin films

“…Itoh et al 7 have reported fragmentation of C 60 induced by impacts of 2 MeV Si 4+ ions. T.Le.Brun et al 8 have reported ionization and fragmentation in C 60 molecules by impacts of Xe ions in the energy range of 420 -625 MeV. Subsequently 9 , there has been some interest in studying the phase transformations of the C 60 solids using MeV energies.…”

“…In general, it has been observed by various research groups that the C 60 materials undergo heavy damage by low energy ion irradiation in the energy range 30 -300 keV of various ions [2][3][4][5][6] . There has also been study on irradiation effects of MeV energies on fullerene films [7][8][9][12][13][14] . Itoh et al 7 have reported fragmentation of C 60 induced by impacts of 2 MeV Si 4+ ions.…”

“…The interest was stimulated by the potential of fullerene material towards superconductivity by implanting foreign ions in the fullerene cage and other applications like optical limiters, electrical storage devices, C 60 based diodes and transistors etc. Irradiation effects of keV and some MeV energies has been investigated [2][3][4][5][6][7][8][9][10][11][12][13][14] . In general, it has been observed by various research groups that the C 60 materials undergo heavy damage by low energy ion irradiation in the energy range 30 -300 keV of various ions [2][3][4][5][6] .…”

Event-by-Event Analysis of Collision-Induced Cluster-Ion Fragmentation: Sequential Monomer Evaporation versus Fission Reactions

“…The latter has been inferred indirectly from the U-shaped nature of the fragmentation pattern and other properties of the statistical decay mechanism [9,13,17,18,32], and it was concluded that reactions of type (2) are due to prompt multifragmentation events. The present results shed new light on the nature of this event.…”

“…In contrast, high-energy deposition, e.g., by collisions of the clusters with high-energy heavy particles or vice versa [9][10][11][12] and by collisions of clusters with multiply charged ions [13,14], has led to bimodal fragment ion distributions which have been interpreted (i) by the presence of sequential (monomer) evaporations (see above) leading to the production of fragment ions with large masses and (ii) by the presence of multifragmentation processes leading to the formation of the fragment ions with the small masses. These bimodal distributions, sometimes exhibiting a U shape [10,12], sometimes consisting of two peaks separated by a strong minimum [9,11,13,14] have also been observed for primary mass spectra after electron impact or photon impact ionization of C 60 and after C 60 ions impacting a surface (see [15] and references therein). Moreover, these distribution patterns obtained are similar to what have been seen in nuclear fragmentation [16].…”