In this PhD thesis, a novel microscopy technique is presented that exploits cryogenic measurements to push optical resolution to the Angstrom level. The near atomic resolution is made possible by the substantial improvement of the molecular photostability at liquid helium temperature. This method allows one to gain structural information of proteins or other molecular complexes that might not be accessible by existing analytical methods such as X-ray crystallography, cryogenic electron microscopy or magnetic resonance spectroscopy. These results mark record optical resolution and demonstrate that optical resolution can be pushed beyond the diffraction limit by nearly one thousand times.
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