Thema der Dissertation:
Photostability of Organic Compounds Under Martian Surface Conditions and Implications for In-situ Spectroscopy Experiments on the International Space Station
Photostability of Organic Compounds Under Martian Surface Conditions and Implications for In-situ Spectroscopy Experiments on the International Space Station
Abstract: The search for molecular biosignatures is a central objective of current Mars exploration. However, long-term transformation mechanisms of organic compounds on the Martian surface is strongly influenced by ultraviolet radiation, atmospheric composition, and interactions with mineral phases. This thesis investigates such mechanisms in biomolecular thin films under Mars-relevant conditions using laboratory-based experiments. Amino acids, flavonoids, and porphyrin derivatives were studied under different atmospheric conditions and in association with clay minerals and iron oxide surfaces by using IR, UV–Vis, and VUV/UV spectroscopy. Beyond the investigation of biomolecular photostability, this work contributes to the development of next-generation astrobiology missions OREOcube and Exocube.Chem by establishing sample preparation protocols, validating experimental hardware, and developing a Mars simulation chamber for irradiation studies. The results demonstrate that both atmospheric composition and mineralogy fundamentally influence the photochemical evolution of organic molecules. These findings improve our understanding of biosignature preservation on Mars and support the design and interpretation of future in situ life-detection experiments.
Zeit & Ort
07.09.2026 | 16:00
Hörsaal A (1.3.14)
(Fachbereich Physik, Arnimallee 14, 14195 Berlin)