Hannover 2016 – scientific programme
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MO: Fachverband Molekülphysik
MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets
MO 19.21: Poster
Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof
Implementation of a Cryogenic Multipole Ion Trap for THz Spectroscopy of Molecular Systems — •Lena Remmers, Moritz Fischer, Steffen Spieler, Katharina Geistlinger, and Roland Wester — Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
Spectroscopy of rovibrational transitions by continuous THz radiation is a promising approach to unravel the structure and dynamics of weakly bound systems. In our group a new setup combining a electro-spray ionization source and a cryogenic multipole ion trap is beeing built. This approach provides access to intact macromolecules in the gas phase with positive or negative charge. These are focused and guided by means of an ion funnel and a quadrupole ion guide. By use of a quadrupole mass selector the ions are selectively loaded into the 16-pole trap. The cryogenic trap provides a possibility for groundstate preparation of trapped ions via buffergas cooling. This setup will be used to perform rotational spectroscopy of the target molecular ion using a THz radiation source (based on difference frequency mixing of two near infrared diode lasers) and an additional IR-Laser entering the trap perpendicular to the ion path. Here we report on the status and the characteristics of this experiment and on latest results on trapping ions and clusters. First experiments are planed on small OH−(H2O)n and H3O+(H2O)n clusters.