Charge instabilities in ion-metal cluster collisions

Bergen, T.; Biquard, X.; Bjørnholm, S.; Blundell, S. A.; Brénac, A.; Chandezon, F.; Guet, C.; Huber, B. A.; Jalabert, D.; Plagne, Laurent

doi:10.1063/1.54512

Cited by 3 publications

(4 citation statements)

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“…These results obviously imply that the degree of excitation of parent ion is induced more strongly as the multiple ionization proceeds. As is known already from previous studies [1,2,7], excited parent ions cool off via successive C 2 emission with revealing exponential decay patterns, as observed in this work. A careful observation shows that the exponential decay pattern, or the rate of decrease of daughter ions, depends remarkably on the projectile species.…”

Section: Resultssupporting

confidence: 87%

“…A number of studies have been performed on ionization and fragmentation mechanisms of C 60 , showing various fragment patterns for different impact methods . In photoabsorption interactions, vibrational excitation followed by successive C 2 emission is known to be the dominant mechanism of fragmentation [1][2][3]7]. On the other hand, in collisions with charged particles the fragmentation becomes complicated due to Coulomb interactions .…”

Section: Introductionmentioning

confidence: 99%

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Strong projectile dependence of C₆₀fragmentation by MeV-energy heavy ions

Tsuchida¹,

Itoh²,

Miyabe³

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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Experimental results are presented for ionization and fragmentation of C60 bombarded by various projectile ions of H+, Li1,2+, B1,2+, O2+, Si1,2+, Ag2+ and Au3+ with velocities 0.9v0-3v0 (v0: Bohr velocity). Mass distributions of light fragment ions Cn+ (n = 1-12) are found to change drastically depending on the projectile species or atomic number Zp. The result indicates that multifragmentation of C60 takes place at small impact parameters where the projectile nuclear charge is less screened. It is found that for heavy projectiles multiple ionization is apt to occur and lighter fragment ions are produced predominantly. Assuming the multifragmentation caused by penetration of the projectile through C60, energy deposition to C60 is calculated, and internal energy and ionization degree of C60 after collisions are estimated. It is concluded that the final fragment pattern is governed by the internal energy.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Strong projectile dependence of C₆₀fragmentation by MeV-energy heavy ions

Tsuchida¹,

Itoh²,

Miyabe³

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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“…A large number of works is currently devoted to the study of collision processes involving complex partners such as cluster-atom (ion) systems. From an experimental point of view, this is due to the increasing development of beams of cluster ions of selected mass, charge, energy [1][2][3][4][5] and/or improvement of multicoincidence detection techniques [6][7][8][9][10]. From a theoretical point of view, there has been a growing associated activity with the theoretical treatments becoming gradually more and more sophisticated.…”

Section: Introductionmentioning

confidence: 99%

Dissociative and non-dissociative electron capture in medium-velocity cluster-atom collisions; evidence of contributions due to multi-electron processes

Fossé¹,

Chabot²,

Champion³

2000

J. Phys. B: At. Mol. Opt. Phys.

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Dissociative and non-dissociative electron capture cross sections for medium-velocity collisions of carbon ionic cluster projectiles with helium atoms have been measured (v = 2, 2.6 and 4 au C + n n 5). This has been done using a 4π multifragment detector operating either in the full-efficiency mode for the extraction of total electron capture cross sections, or in a partialefficiency mode (anticoincidence method) for the extraction of the dissociative and non-dissociative parts. The dissociative part has been found to be the largest one in all cases, increasing with n and v. The role of the cluster temperature, not precisely known, may be important but cannot explain all the observed experimental results, in particular the appearance of quite large branching ratios for dissociation into three fragments (n 3). In order to explain this multifragmentation, the multi-electron process of capture-projectile excitation is invoked. Another multi-electron process is directly extracted from these collisions, namely, the transfer-ionization two-electron process whose relative contribution with respect to single capture is found to increase with the velocity.

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“…( 1)), can be detected and their number (r-s) be determined with the aid of semiconductor detectors. In recent years some of these techniques have been applied by several groups [10][11][12][13][14][15][16][17][18]. Particularly, the application of coincidence techniques (measuring the correlation between projectile-and recoil ions, or electrons and recoil ions, or electrons and projectile-and recoil ions) allow to characterise the collision rather complete and to control the impact parameter and thus, the transferred energy.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Ionisation and Excitation in Ion-Cluster Collisions

Huber

2003

Phys. Scr.

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Collisions between ions and clusters are an efficient tool to prepare clusters in high charge states. We discuss recent results on the mechanisms and the degree of ionisation which can be obtained in close and in peripheral collisions with projectiles in low and high charge states. Furthermore, the energy which is transferred in the collision as well as the energy sharing between the electronic system and the vibrational modes are considered. Recent experiments have shown, that multi-ionisation of clusters by highly charged ions is possible without essential heating; the energy transfer can be as low as 2 eV for a five-fold ionisation.

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Charge instabilities in ion-metal cluster collisions

Cited by 3 publications

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Strong projectile dependence of C₆₀fragmentation by MeV-energy heavy ions

Strong projectile dependence of C₆₀fragmentation by MeV-energy heavy ions

Dissociative and non-dissociative electron capture in medium-velocity cluster-atom collisions; evidence of contributions due to multi-electron processes

Ionisation and Excitation in Ion-Cluster Collisions

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Charge instabilities in ion-metal cluster collisions

Cited by 3 publications

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Strong projectile dependence of C60fragmentation by MeV-energy heavy ions

Strong projectile dependence of C60fragmentation by MeV-energy heavy ions

Dissociative and non-dissociative electron capture in medium-velocity cluster-atom collisions; evidence of contributions due to multi-electron processes

Ionisation and Excitation in Ion-Cluster Collisions

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Strong projectile dependence of C₆₀fragmentation by MeV-energy heavy ions

Strong projectile dependence of C₆₀fragmentation by MeV-energy heavy ions