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VOLUME 69 | ISSUE 10 | PAGE 686
On the "supercollimation" of x-ray beams in rough interfacial channels
PACS: 29.30.Kv
The transmission of x-rays through rough submicron narrow channels is investigated by numerical simulation with diffraction and decay of coherence taken into account. It is found that transmission is strongly increased for directions within the diffraction limit X/d (d is the channel width). For larger angles strong roughness scattering results in rapid decay of coherence and absorption of the x-ray beams. When the coherent part is a significant portion of the transmitted beam, its divergence is also within the diffraction limit, which can be an order of magnitude smaller than the Fresnel angle of total external reflection. The effects are explained with the statistical theory of x-ray scattering in a rough transitional layer. Such "supercollimation" can be used for fine angular discrimination of χ radiation and for the production of very narrow diffraction-quality x-ray beams.