Stuttgart 2012 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 8: Ion Trap and FT-ICR-MS, Molecules, Clusters and Reactions

MS 8.5: Talk

Thursday, March 15, 2012, 15:30–15:45, V57.06

Buffer-gas cooling in a linear radiofrequency quadrupole trap at the CTF — •Christian Breitenfeldt¹, Klaus Blaum², Mike Froese², Michael Lange², Gerrit Marx¹, Sebastian Menk², Birgit Schabinger¹, and Lutz Schweikhard¹ — ¹Institut für Physik, Ernst-Moritz-Arndt Univ., 17489 Greifswald, Germany — ²Max-Plank-Institut für Kernphysik (MPIK), 69117 Heidelberg, Germany

The Cryogenic Trap for Fast ion beams (CTF) is an Electrostatic Ion Beam Trap (EIBT) setup investigating the decay of anions with complex multi-body internal structure at cryogenic temperatures, located at the MPIK in Heidelberg. Recent measurements showed a strong influence of the rotational and vibrational temperatures in the decay of SF₆⁻. For more detailed studies using, e.g. laser excitation from well defined initial states, the injection of pre-cooled molecular ions and clusters into the CTF will be of great advantage. Hence, we plan to install a linear RadioFrequency Quadrupole (RFQ) trap to store the hot ions from the source and cool them via buffer gas before their injection into the EIBT. Internal pre-cooling of ions in this buffer-gas RFQ trap can be much faster than in the EIBT. In addition, the implementation of a linear RFQ trap will allow a more effective use of the ions produced by the source. As we typically employ microsecond long pulses, which are stored for several seconds, all other ions are currently lost. By the use of the linear RFQ trap, however, it will be possible to accumulate ions throughout most of the injection cycle, vastly improving the sensitivity and the number of different species accessible.