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The goal of this work has been to calibrate sensitivities and fragmentation pattern of\udvarious molecules as well as further characterize the lab model of the ROSINA Double\udFocusing Mass Spectrometer (DFMS) on board ESA’s Rosetta spacecraft bound to\udcomet 67P/Churyumov-Gerasimenko. The detailed calibration and characterization of\udthe instrument is key to understand and interpret the results in the coma of the comet.\udA static calibration was performed for the following species: Ne, Ar, Kr, Xe, H2O,\udN2, CO2, CH4, C2H6, C3H8, C4H10, and C2H4. The purpose of the calibration was\udto obtain sensitivities for all detectors and emissions, the fragmentation behavior of the\udion source and to show the capabilities to measure isotopic ratios at the comet. The\udcalibration included the recording of different correction factors to evaluate the data,\udincluding a detailed investigation of the detector gain. The quality of the calibration\udthat could be tested for different gas mixtures including the calibration of the density\udinside the ion source when calibration gas from the gas calibration unit is introduced.\udIn conclusion the calibration shows that DFMS meets the design requirements and that\udDFMS will be able to measure the D/H at the comet and help shed more light on the\udpuzzle about the origin of water on Earth

Sensitivity and fragmentation calibration of the ROSINA double focusing mass spectrometer