Ejection of a doubly charged light fragment in asymmetric fission of multiply charged fullerenes

Abstract

In Ar 8+ -C60 collisions, quintuply charged fullerene C60 5+ is produced via multiple electron capture by slow highly charged ions from neutral fullerenes. Quasi-symmetric charge division (3, 2) is observed in asymmetric mass division fission processes, i.e. C60 5+ → C60−m 3+ + Cm ++ (m 60). In such fission channels, the charge density of the doubly charged light fragment is much higher than that of the triply charged heavy one. The measured population distribution as a function of the mass of the doubly charged fragment m is interpreted tentatively by fission barrier analyses.

Multi-fragmentation of C60after collisions with Arz ions

“…A similar behaviour was found in collisions with protons [14,28]. For higher charge states (q 4) super-asymmetric fissions into a smaller fullerene and an even or odd sized, singly charged carbon cluster compete with the C 2 evaporation (figure 3(b)) [35,36].…”

Multiply Charged Neon Clusters: Failure of the Liquid Drop Model?

“…The process happens spontaneously when the cluster reaches the Rayleigh limit (X 1) [3], or it can be induced in clusters with fissilities below X 1 by collisional excitation or heating by photoexcitation [4,5]. Coulomb explosion occurs after electron or photon ionization of clusters [5][6][7], collisions with high energy transfer [8], or collisions with highly charged ions [9][10][11]. A novel Auger-like mechanism, interatomic Coulomb decay (ICD) by which electronic vacancies are rapidly filled by valence electrons from neighboring atoms, has been suggested to explain the surprisingly efficient formation of multiply charged van der Waals clusters by electron or photon ionization [12].…”

“…For smaller atomic clusters, mass spectrometry has successfully been applied to characterize fissioning of metallic [1,6,11,15] and van der Waals systems [4,6,7,10] and fullerenes [9,16].…”

A zero dead-time, multihit, time and position sensitive detector based on micro-channel plates

“…In many fields of physics, ranging from atomic 1-3 and molecular physics [4][5][6][7][8][9][10][11][12][13][14] to material science, [15][16][17][18] the simultaneous detection, resolved in time and position, of several particles produced in a same physical event is required to fully grasp the information. This is the case, for example, in experiments aiming to disentangle the dynamics of the multifragmentation of molecules or clusters accelerated at keV energies.…”