SUBMICROMETER X-RAY-BEAM PRODUCTION BY A THIN-FILM WAVE-GUIDE

A hard x-ray waveguide capable of reducing a 13 keV monochromatic beam in one direction from 30 to only 0.1 mu m has been characterized with synchrotron radiation. The guiding structure consisted of a carbon la yer sandwiched between two Ni layers sputter-deposited onto float glas s. A beam exiting at the end of the guide in guiding direction was obs erved when a resonance effect due to the formation of x-ray standing w aves in the total reflection region takes place. The measured beam div ergence (1.3 mrad) agrees with expectations, The total efficiency (exi ting photon flux/incident photon flux) can ideally exceed 10(-2) but i s only 10(-4) for this first prototype. (C) 1996 American Institute of Physics.