I. K. Nasyrov, E.A. Semenov, Z.J. Khalitov

The specific to cylindrical crystals phenomenon of additional scattering of radiation by the site circles, helical lines and spirals in an internal hole of nanotubes, earlier considered theoretically only for a case of a circular lattice, is considered. The results of calculation of spectral and angular dependences, and also spatial distribution of intensity of Fresnel diffraction of short-wave radiation in an internal hole of nanotubes with circular, chiral (helical), spiral and radial lattices are submitted. It is shown, that in the case of longitudinal passage of radiation with characteristic wavelength the standing wave can arise, depending on a type of nanotube, both in its internal hole, and in the sphere of a lattice. The intensity of a standing wave on a nanotubes axis accrues in a line: chiral, spiral, circular, radial nanotube. The dependence of spatial distribution of intensity on quantity of nanotubes layers is considered. The phenomenon is possible to interpret as waveguide-effect in nanotubes, having a diffractional nature.