The main focus of Schmahl's work, and his most important achievement, was the development of full-field soft X-ray microscopy. He was one of the first to recognize the potential of this method and to identify and follow the technological approach of using zone plates as lenses in such a microscope.[3][P 1][P 2] Schmahl and his collaborators further developed the technique until it was ready for application in two- and three-dimensional imaging of biological samples.[4][P 3][P 4][P 5][P 6]
Schmahl founded the Institute for X-ray Physics at the University of Göttingen and headed it until his retirement in 2002.[5] He was also one of the founders and the first organizer of the International Conference on X-Ray Microscopy, which has been held every three years since 1983 and biennially since 2008.[6]
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Schmahl, G.; Rudolph, D. (1969). "Lichtstarke Zonenplatten als abbildende Systeme für weiche Röntgenstrahlen" [High power zone plates as image forming systems for soft X rays]. Optik (Jena) (in German). 29: 577. Bibcode:1969Optik..29..577S.
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Niemann, B.; Rudolph, D.; Schmahl, G. (1974). "Soft-x-ray imaging zone plates with large zone numbers for microscopic and spectroscopic applications". Optics Communications. 12 (2): 160–163. Bibcode:1974OptCo..12..160N. doi:10.1016/0030-4018(74)90381-2.
^DE 3642457, G. Schmahl, D. Rudolph, "Röntgen-Mikroskop", published 30 June 1988, assigned to Carl-Zeiss-Stiftung
^US 4870674, G. Schmahl, D. Rudolph, "X-ray microscope", published 26 September 1989, assigned to Carl-Zeiss-Stiftung
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Schmahl, G.; Rudolph, D.; Guttmann, P.; Schneider, G.; Thieme, J.; Niemann, B. (1995). "Phase contrast studies of biological specimens with the x-ray microscope at BESSY". Review of Scientific Instruments. 66: 1282–1286. doi:10.1063/1.1145955.
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Weiß, D.; Schneider, G.; Niemann, B.; Guttmann, P.; Rudolph, D.; Schmahl, G. (2000). "Computed tomography of cryogenic biological specimens based on X-ray microscopic images". Ultramicroscopy. 84 (3–4): 185–197. doi:10.1016/S0304-3991(00)00034-6. PMID10945329.