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MO: Fachverband Molekülphysik

MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics

MO 19.24: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

A 6 K Ion Trap Triple Mass Spectrometer for Isomer-Selective IR/IR Photodissociation Experiments — •Nadja Heine and Knut R. Asmis — Fritz-Haber-Institut der MPG, Berlin

Mass-selective infrared photodissociation (IR-PD) combined with electronic structure calculations, is currently the most generally applicable technique to determine the structure of gas phase cluster ions. To assure that the clusters are in their vibrational ground state they are typically buffer-gas cooled in a cryogenic ion trap. However, even at low temperatures often multiple isomers are present, each contributing to the measured IR-PD spectra. In order to separate the contribution from each isomer spectroscopically, we present here the design of a new 6K ion trap triple mass spectrometer, which allows for IR/IR population-labeling measurements. Ions are produced in a nanospray/quadrupole mass filter/ring electrode ion trap setup. Key feature of the instrument is this source for mass-selected, cryogenically cooled ions with a custom-built linear reflectron time-of-flight mass spectrometer, which allows for the IR-MS-IR-MS capability required for IR/IR population labeling spectroscopy. First results on protonated water clusters H+(H2O)n with n=5-10 are presented.