Rostock 2019 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 3: Mass Spectrometry - Posters
MS 3.12: Poster
Dienstag, 12. März 2019, 16:30–18:15, S Fobau Physik
A graphene-based neutral particle detector — •Jessica Warbinek1, David Leimbach1, Di Lu2, Dag Hanstorp2, David Pegg3, Jakob Welander2, Avgust Yurgens4, and Klaus Wendt1 — 1Johannes Gutenberg-Universität Mainz — 2University of Gothenburg — 3University of Tennessee — 4Chalmers University of Technology Gothenburg
A transparent neutral particle detector for applications in the fields of atomic and molecular physics as well as mass spectrometry is presented, which is operational for particle energies in the range of few hundreds eV to a maximum of some tens of keV. The traditionally used target material for the initial conversion electrode, indium tin oxide (ITO), which has to combine good optical transparency with reasonable electric conductivity, has been replaced by a graphene layer. This substitution leads to a transmission of signicantly shorter wavelengths of light down to 230 nm compared to ITO-based detectors, which are limited at about 335 nm. In this way collinear laser - ion beam interactions on atoms, molecules and clusters of ions, used e.g. for photodetachment measurements, are enabled throughout the whole visible spectral range down to the far UV. Moreover, the background signal from the photoelectric effect is drastically reduced when using graphene. The application of this new detector type will enable studies on electron affinities of rare radioisotopes and was already successfully used for the first ever determination of this quantity in astatine at ISOLDE/CERN.