The new scanning transmission X-ray microscope at BESSY II

Abstract

A new scanning transmission X-ray microscope (STXM) is under construction and will be operated at the undulator U41 of the BESSY II storage ring. In the monochromator without entrance or exist slits, a plane grating with variable line density is used. A spectral resolution of 2200 to 6500 is expected in the energy range of 680 eV to 200 eV. The sample is located in air so it can be exchanged easily. The photon rate in the focus will be of the order of 109/s at a monochromaticity of 3000. A pnCCD capable of handling this rate will be used as a detector.