Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media
Abstract
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 nanotubes length varied between 0.1 and 1 mu m. We describe the repulsive interaction between a proton and the nanotubes atoms in a continuum-potential approximation based on the Doyle-Turner potential, whereas the attractive image force on a proton is calculated using a two-dimensional 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.
Source:
Physical Review A, 2008, 77, 3
DOI: 10.1103/PhysRevA.77.032903
ISSN: 1050-2947
WoS: 000254541100135
Scopus: 2-s2.0-40949094383
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VinčaTY - JOUR AU - Borka, Duško AU - Mowbray, Duncan J. AU - Mišković, Zoran L. AU - Petrović, Srđan M. AU - Nešković, Nebojša B. PY - 2008 UR - https://vinar.vin.bg.ac.rs/handle/123456789/3399 AB - 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 nanotubes length varied between 0.1 and 1 mu m. We describe the repulsive interaction between a proton and the nanotubes atoms in a continuum-potential approximation based on the Doyle-Turner potential, whereas the attractive image force on a proton is calculated using a two-dimensional 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. T2 - Physical Review A T1 - Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media VL - 77 IS - 3 DO - 10.1103/PhysRevA.77.032903 ER -
@article{ author = "Borka, Duško and Mowbray, Duncan J. and Mišković, Zoran L. and Petrović, Srđan M. and Nešković, Nebojša B.", year = "2008", abstract = "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 nanotubes length varied between 0.1 and 1 mu m. We describe the repulsive interaction between a proton and the nanotubes atoms in a continuum-potential approximation based on the Doyle-Turner potential, whereas the attractive image force on a proton is calculated using a two-dimensional 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.", journal = "Physical Review A", title = "Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media", volume = "77", number = "3", doi = "10.1103/PhysRevA.77.032903" }
Borka, D., Mowbray, D. J., Mišković, Z. L., Petrović, S. M.,& Nešković, N. B.. (2008). Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media. in Physical Review A, 77(3). https://doi.org/10.1103/PhysRevA.77.032903
Borka D, Mowbray DJ, Mišković ZL, Petrović SM, Nešković NB. Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media. in Physical Review A. 2008;77(3). doi:10.1103/PhysRevA.77.032903 .
Borka, Duško, Mowbray, Duncan J., Mišković, Zoran L., Petrović, Srđan M., Nešković, Nebojša B., "Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media" in Physical Review A, 77, no. 3 (2008), https://doi.org/10.1103/PhysRevA.77.032903 . .