Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.86: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Thermal desorption spectroscopy of interstellar relevant molecules on Forsterit and Olivine — •Robert Frigge, Tushar Suhasaria, Nadine Heming, Björn Siemer, and Helmut Zacharias — Physikalisches Institut, Universität Münster, Germany
Chemical surface reactions on dust grains are a possible way of molecule formation in the Interstellar Medium (ISM). These grains typically consists of carbonaceous and silicate particles embedded in icy mantles which are formed by molecules like CO, CO2, H2O or CH4.
Temperature programmed desorption (TPD) is used to investigate the binding energy and reaction order of several interstellar relevant molecules like D2, CO, CO2, CH4, and D2O on different interstellar silicate analogues like Forsterite (Mg2SiO4) and Olivine (MgxFe1−xSiO4). The experimental set-up consists of a quadrupole mass spectrometer, a dosing chamber and a liquid helium cooled sample holder. Due to this set-up it is possible to investigate the behavior of these molecules at very low temperatures (≈ 5 K) comparable to the ISM. Further due to the dosing chamber it is possible to prepare a sample with a precise and low coverage. We present desorption spectra, binding energies and their coverage dependence on both Olivine and single crystal Forsterite.