The donut and dynamic polarization effects in proton channeling through carbon nanotubes

被引:16
作者
Borka, D. [1 ]
Mowbray, D. J. [2 ]
Miskovic, Z. L. [3 ]
Petrovic, S. [1 ]
Neskovic, N. [1 ]
机构
[1] Vinca Inst Nucl Sci, Lab Phys 010, Belgrade 11001, Serbia
[2] Tech Univ Denmark, Dept Phys, CAMD, DK-2800 Lyngby, Denmark
[3] Univ Waterloo, Dept Appl Math, Waterloo, ON N2L 3G1, Canada
来源
NEW JOURNAL OF PHYSICS | 2010年 / 12卷
基金
加拿大自然科学与工程研究理事会;
关键词
HIGH-ENERGY PROTONS; ANGULAR-DISTRIBUTIONS; RAINBOW SCATTERING; THIN CRYSTAL; X-RAY; IONS; PARTICLES; SI; TRANSMISSION; SILICON;
D O I
10.1088/1367-2630/12/4/043021
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We investigate the angular and spatial distributions of protons with an energy of 0.223 MeV after channeling them through an (11, 9) single-wall carbon nanotube of 0.2 mu m length. The proton incident angle is varied between 0 and 10 mrad, being close to the critical angle for channeling. We show that, as the proton incident angle increases and approaches the critical angle for channeling, a ring-like structure is developed in the angular distribution-the donut effect. We demonstrate that it is the rainbow effect. If the proton incident angle is between zero and half of the critical angle for channeling, the image force affects considerably the number and positions of the maxima of the angular and spatial distributions. However, if the proton incident angle is close to the critical angle for channeling, its influence on the angular and spatial distributions is considerably decreased. We demonstrate that an increase of the proton incident angle can lead to a significant rearrangement of the propagating protons within the nanotube. This effect may be used to locate atomic impurities in nanotubes as well as for creating nanosized proton beams to be used in materials science, biology and medicine.
引用
收藏
页数:17
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