Helical Diffraction from Tubular Structures

An electron diffraction technique is described that enables both the calculation of electron diffraction intensity distribution from a given tubule structure and the deduction of its true helicity from an experimental electron diffraction pattern of the nanotube. The cylindricality and the helicity of nanotubes are taken into full account. An example of the applications is also presented as an illustration for the simulation of the electron diffraction pattern and the deduction of its true helicity of a single-walled helical carbon nanotube of indices [12, 1].