Stopping power of large homonuclear clusters: Influence of cluster structure

Vicanek, M.; Abril, Isabel; Arista, N. R.; Gras‐Martí, A.

doi:10.1103/physreva.46.5745

Cited by 41 publications

(4 citation statements)

References 37 publications

(34 reference statements)

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“…These are of great interest, as they may play an important role in real physical situations where usually a large number of ions interact simultaneously with the target plasma. This subject has already been discussed by other authors for two correlated ions (D'Avanzo et al 1992;Bret & Deutsch 1993) and clusters of ions (Deutsch & Tahir 1992;Vicanek et al 1992). Because of the periodic continuation of the cube containing one ion in the MD simulations, we consider in fact a moving rigid ion lattice rather than a single ion.…”

Section: Ion-ion Correlation Effectsmentioning

confidence: 93%

“…The dielectric description offers the possibility to calculate the stopping power of any ion configuration (Vicanek et al 1992;Bret & Deutsch 1993) and to study ion-ion correlation effects on the stopping power. These are of great interest, as they may play an important role in real physical situations where usually a large number of ions interact simultaneously with the target plasma.…”

Section: Ion-ion Correlation Effectsmentioning

confidence: 99%

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Stopping power of heavy ions in strongly coupled plasmas

1995

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We investigate the stopping power of heavy ions in strongly coupled electron plasmas by performing molecular dynamics (MD) computer simulations. A comparison with conventional weak coupling theories shows that these fail in describing the stopping power at low ion velocities and strong coupling. Then nonlinear screening effects become important and this causes a change in the dependence of the stopping power on the ion charge Z p at low ion velocities. From the MD simulation, we find the stopping power to behave like Z P M instead of the weak coupling behavior Z p ln(const/Z p ). Similar results were recently obtained by experiments in connection with electron cooling at heavy ion storage rings.

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Section: Ion-ion Correlation Effectsmentioning

confidence: 93%

Section: Ion-ion Correlation Effectsmentioning

confidence: 99%

Stopping power of heavy ions in strongly coupled plasmas

1995

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“…The transport of cluster ions in plasmas has been usually studied as a correlated electronic stopping [7][8][9][10][11] and not much attention has been devoted to investigating a complete process where all main cluster interactions are taken into account. This complete process has been studied regularly in solid targets during the past [12][13][14][15][16], but it is not until now that these studies extend to plasma targets.…”

Section: Introductionmentioning

confidence: 99%

Plasma wake and nuclear forces on fragmented transport

Barriga-Carrasco

Deutsch

2006

Plasma Phys. Control. Fusion

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The objective of the present work is to study the target electronic and nuclear interactions produced when a H + 2 ion traverses classical plasma matter. Electronic interactions are treated by means of the dielectric formalism while nuclear interactions are dealt within the classical dispersion theory through a Monte Carlo computer code. The interactions through plasma electronic medium among close ions are called wake forces. We checked that these forces screen the Coulomb explosions of the two fragmented protons from the same H + 2 ion decreasing their relative distance in the analysed cases. These forces align the interproton vector along the motion direction. They also tend the two-proton energy loss to the value of two isolated protons when at early times it is rather larger. Nevertheless most parts of these wake effects cannot be corroborated experimentally as they are masked by the projectile collisions with target nuclei in our numerical experiment. These collisions cancel the screening produced by the wake forces, increasing the interproton distance even faster than for bare Coulomb explosion. Also they misalign the interproton vector along the motion direction and contribute moderately to increase the energy loss of the fragmented H + 2 ion. These nuclear collisions effects are more significant in reducing projectile velocity.

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“…This model may be applicable to large clusters but is not useful for small molecules, as stated in ref. [22]; however, the molecules involved in this discussion are too small and with a geometry that does not warrant the validity of the spherical ball model. In addition, Mišković et al [20] suppose that the Coulomb explosion is inhibited by the wake forces, and that the multiple nuclear scattering is the dominant process in the determination of the temporal evolution of the molecular structure.…”

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confidence: 99%

Vicinage effects in the charge state of swift molecular constituents traversing thin foils

2001

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PACS. 34.50.Dy -Interactions of atoms and molecules with surfaces; photon and electron emission; neutralization of atoms. PACS. 34.50.Fa -Electronic excitation and ionization of atoms (including beam-foil excitation and ionization). PACS. 36.40.Wa -Charged clusters.Abstract. -We present a method to calculate the charge state of the atomic ions resulting from the fragmentation of swift molecular ions when traversing thin foils. The mutual influence of the neighbouring ions in the charge state of each atomic ion and the asymmetries in the screening close to the exit surface as each ion leaves the foil is taken into account. We have found the latter effect to be particularly important. Our calculations compare remarkably well with experimental data available for different molecular ions and foil thicknesses.The charge state of a swift atomic ion moving through a solid is different when it is isolated or when it forms part of a cluster. In general, for a given velocity the average charge state of each molecular constituent is lower than that of the isolated atomic ion and depends on the molecular structure and velocity, as well as on the foil thickness [1][2][3][4][5]. This phenomenon is related to the proximity of the neighbouring atomic ions as they travel through the target, and it has been extensively studied, both theoretically and experimentally, during the last decades [1][2][3][4][5][6][7].Recent experiments with N + 2 and C + n (n = 3-10) molecular ions incident on amorphous carbon foils [3,5] show that the vicinage effects in the charge state of each molecular constituent decreases with the foil thickness and increases with the number of atomic ions that form the molecular ion.In this work we present a model to calculate the charge state of an atomic ion, resulting from the fragmentation of a molecular ion, due to the vicinage effects produced by its neighbouring atomic ions, when they travel inside the solid target in a correlated manner.When a swift molecular ion with velocity v bombards a solid, it loses its binding electrons in the first atomic layers, and dissociates in its atomic constituents. Thereafter, mainly three processes affect the correlated motion of these atomic ions: the change in their electronic c EDP Sciences

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Stopping power of large homonuclear clusters: Influence of cluster structure

Cited by 41 publications

References 37 publications

Stopping power of heavy ions in strongly coupled plasmas

Stopping power of heavy ions in strongly coupled plasmas

Plasma wake and nuclear forces on fragmented transport

Vicinage effects in the charge state of swift molecular constituents traversing thin foils

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