In ion-fullerene C60 frontal collisions, an amount of energy is deposited in the C60 target leading to the fragmentation of the C60. Theoretical and experimental investigations have demonstrated that the fragmentation...In ion-fullerene C60 frontal collisions, an amount of energy is deposited in the C60 target leading to the fragmentation of the C60. Theoretical and experimental investigations have demonstrated that the fragmentation scheme of the C60 depends not only on the total excitation energy but also on the nature of the primary electronic and nuclear excitation mechanism. Up to now, the commonly accepted interpretation of the observed mass spectra obtained in ion-C60 experiments is to consider the multi-fragmentation of the C60 being mainly due to the primary electronic interaction. The efficient transfer of the electronic excitation energy towards vibronic modes induces the breakup of the C60 cage in a statistical decay process.展开更多
Citation of the C60^4+ is the same in the two collisions. The strong C+ peak produced in Ar^+-C60 must be due to the elastic collisions (nuclear stopping), because the Ar+ is heavy enough to knock out the C^+ from C60...Citation of the C60^4+ is the same in the two collisions. The strong C+ peak produced in Ar^+-C60 must be due to the elastic collisions (nuclear stopping), because the Ar+ is heavy enough to knock out the C^+ from C60 molecule. In general, the excitation energy depends on the projectile velocity, charge, and mass. Direct vibronic excitation by elastic collisions (nuclear stopping) is predicted for slow heavy ions, while the electronic excitation (electronic stopping) is dominant for fast ions[1]. For example, Schlatholter, et al.[2] found a strong velocity effect in collisions of He^+ with fullerene in the velocity range from 0.1 to 1 a.u. With increasing velocity, the C2 evaporation process decreases and the multi-fragmentation is linearly increasing.展开更多
文摘In ion-fullerene C60 frontal collisions, an amount of energy is deposited in the C60 target leading to the fragmentation of the C60. Theoretical and experimental investigations have demonstrated that the fragmentation scheme of the C60 depends not only on the total excitation energy but also on the nature of the primary electronic and nuclear excitation mechanism. Up to now, the commonly accepted interpretation of the observed mass spectra obtained in ion-C60 experiments is to consider the multi-fragmentation of the C60 being mainly due to the primary electronic interaction. The efficient transfer of the electronic excitation energy towards vibronic modes induces the breakup of the C60 cage in a statistical decay process.
文摘Citation of the C60^4+ is the same in the two collisions. The strong C+ peak produced in Ar^+-C60 must be due to the elastic collisions (nuclear stopping), because the Ar+ is heavy enough to knock out the C^+ from C60 molecule. In general, the excitation energy depends on the projectile velocity, charge, and mass. Direct vibronic excitation by elastic collisions (nuclear stopping) is predicted for slow heavy ions, while the electronic excitation (electronic stopping) is dominant for fast ions[1]. For example, Schlatholter, et al.[2] found a strong velocity effect in collisions of He^+ with fullerene in the velocity range from 0.1 to 1 a.u. With increasing velocity, the C2 evaporation process decreases and the multi-fragmentation is linearly increasing.
