Abstract
Abstract A high-flux, scanning microspectroscope using the very intense, direct radiation from an undulator is introduced and its performance is discussed with various examples. This instrument utilizes the quasi-monochromatic beam from the first undulator at BESSY without monochromatization. Thus, X-ray induced Auger spectroscopy using all available photons above the respective threshold or photoemission using the 2-eV-wide first harmonic of this undulator can be performed. Spatial resolution is achieved in different ways, either simply by an adjustable aperture in front of the sample, yielding a diffraction-limited resolution of, for example, 3–4 μm for the C-Auger spectra, or by two mirrors, a toroidal condenser mirror and a demagnifying ellipsoidal mirror, which focus the aperture onto the sample yielding a resolution in the submicrometer range. Photoemission spectra from a selected spot can be obtained in seconds, or structures can easily be written using photon-induced reactions, because of the extremely high photon density of 1013 photons μm−2. Finally, line scans or 2D images can be recorded by scanning the sample across the focused beam.
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