Tucidide e il crollo degli imperi

High-resolution hard-x-ray microscopy using second-order zone-plate diffraction

“…Indeed, using the optically thin grating approach and the Kirz formula [8], the diffraction efficiency for the 2n order (n = integer) for a perfect ZP is zero and that for the 2n + 1 order is η 2n+1 = η 1 /(2n + 1) 2 . If the ZP has fabrication imperfections, there is also second-order intensity [9]. High-resolution ZP imaging with third-order diffraction was experimentally demonstrated for both soft [5] and hard [6] x-rays.…”