Abstract
Our theoretical calculations show that multi-wall nanotubes (MWNTs) can serve as x-ray waveguides. Two types of waveguiding exist based either on Fresnel or Bragg reflections of x-rays from nanotube walls. Moreover, fast electrons propagating through MWNTs can emit "channeled" transition (CTR) or parametric x-ray (PXR) types of radiation with much greater intensity than in ordinary crystals.
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