Stochastic effects of charge transfer on image interaction and plasmon excitation in ion-surface grazing scattering

Mišković, Z. L.; Goodman, Frank O.; Song, Yuan-Hong; Wang, You‐Nian

doi:10.1016/j.nimb.2004.12.072

Cited by 1 publication

(1 citation statement)

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“…Nevertheless, simultaneous measurements of the angular distributions of transmitted particles in different charge states could reveal a wealth of information on both the image interactions and the charge transfer processes taking place in short nanotubes, in close analogy with the experiments done by Winter [35,46]. On the other hand, for ion channeling through longer nanoubes, the image force itself can be quite strongly affected by the dynamics of the charge-changing events near the nanotube wall, as was shown recently for grazing scattering of protons from an Al surface [48]. The effects of charge transfer will be included in our future ion channeling simulations.…”

Section: Theorysupporting

confidence: 63%

Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media

et al. 2008

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The best level of ordering and straightening of carbon nanotube arrays is often achieved when they are grown in a dielectric matrix, so such structures present the most suitable candidates for future channeling experiments with carbon nanotubes. Consequently, we investigate here how the dynamic polarization of carbon valence electrons in the presence of various surrounding dielectric media affects the angular distributions of protons channeled through (11, 9) single-wall carbon nanotubes. Proton speeds between 3 and 10 a.u., corresponding to energies of 0.223 and 2.49 MeV, are chosen with the nanotube's length varied between 0.1 and 1 µm. We describe the repulsive interaction between a proton and the nanotube's atoms in a continuum-potential approximation based on the Doyle-Turner potential, whereas the attractive image force on a proton is calculated using a twodimensional hydrodynamic model for the dynamic response of the nanotube valence electrons, while assigning to the surrounding medium an appropriate (frequency dependent) dielectric function. The angular distributions of channeled protons are generated using a computer simulation method which solves the proton equations of motion in the transverse plane numerically. Our analysis shows that the presence of a dielectric medium can strongly affect both the appearance and positions of maxima in the angular distributions of channeled protons.

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Section: Theorysupporting

confidence: 63%