Orientational Effect of the Texture of a Carbon-Nanotube Film on CKα Radiation Intensity.

The angular dependence of the intensity of CK_α radiation measured from a film of oriented carbon nanotubes shows an increase in the yield of x-ray fluorescence along the growth direction of the nanotubes. The angular distribution of the intensity of scattered x rays is close in magnitude to the angular distribution of the directivity of nanotubes in the film that is determined by analyzing an electron-microscope image. To explain the propagation of radiation along the nanotubes, two mechanisms are proposed on the basis of reflection from inner walls of a tube (channeling) and an anomalous dispersion of CK_α photons in the carbon medium. © 2005 Pleiades Publishing, Inc. [ABSTRACT FROM AUTHOR]