Berlin 2014 – scientific programme
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MO: Fachverband Molekülphysik
MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques
MO 13.9: Poster
Wednesday, March 19, 2014, 16:30–18:30, Spree-Palais
Perspectives for translational temperature diagnostics of trapped ions by evaporative losses. — •Olga Lakhmanskaya1, Thorsten Best1, Sunil Kumar1, Eric Endres1, Daniel Hauser1, Rico Otto2, Stephanie Eisenbach3, Alexander von Zastrow4, and Roland Wester1 — 1Universität Insbruck, A-6020, Innsbruck, Austria — 2University of California, San Diego, California 92093-0332, United States — 3Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg, Germany — 4Institute for Molecules and Materials IMM, Radboud University Nijmegen, 6525 AJ Nijmegen, The Netherlands
We present a scheme for translational temperature diagnostics of ions in a 22-pole ion trap using data for OH− and D− anions. This scheme is based on the strong dependence of the lifetime of the ions on temperature. While examining loss rates as a function of buffer gas temperature we have found a breakdown of thermalisation for trap temperatures lower than 25 K. We have investigated this feature in more detail and have found that it does not depend on either buffer gas or the trapping parameters. We have also investigated two regimes for ion losses, either over one of the two end cap electrodes (axial direction) or over the effective potential (radial direction). We have found that evaporation over the end caps may be suitable for translational thermometry.