Divergence behavior due to surface channeling in capillary optics

Recent studies on the transmitting and focusing properties of capillary opt ical systems have shown that several unexpected effects take place during t he experiments. One such effect is a decrease in the beam divergence behind the capillary structures. In this letter, we present results on x-ray scat tering at grazing angles inside capillaries. During x-ray propagation in ca pillary channels, there is a strong angular redistribution of the beam, whi ch has been explained in the framework of the wave scattering theory. (C) 2 001 American Institute of Physics.