Bernhard Knoll

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We have enhanced the apertureless scattering-type scanning near-field optical microscope by two improvements which together achieve a recording of the true near field without any height-induced artefact. These are the use of interferometric detection of the scattered light on one hand, and the use of higher-harmonic dither demodulation of the scattered(More)
SUMMARY The introduction of the new ÖBB management operation system has to result in an increase in reliability and quality. At the same time, operational costs are to be reduced. These goals can only be achieved by concentrating the responsible staff on a few locations. Consequently, the traditional train supervision has to be replaced by a technical(More)
We assembled two independent data sets (ferns and angiosperms) and used the lycophyte Huperzia as the outgroup (not shown in Fig. 1) for both. For ferns, we sampled the chloroplast rbcL and rps4 genes for 45 taxa: 41 leptosporangiate ferns from all major lineages (focusing within the polypods), one horsetail, two seed plants, and the outgroup. For(More)
We explore the performance of a scanning near-field infrared microscope, which works by scattering tightly focused CO2 laser radiation (lambda = 10 microm) from the apex of a metallized atomic force microscope tip. The infrared images of test samples prove a spatial resolution of 30 nm and are free of topographical and inertial artefacts, thus they should(More)
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