Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Cold Molecules 2

MO 14.3: Talk

Thursday, March 20, 2014, 11:00–11:15, BEBEL HS213

Thermometry of Cold Trapped Molecular Anions in Multipole RF-Ion Traps — •Daniel Hauser, Seunghyun Lee, Olga Lakhmanskaya, Eric Endres, Sunil Kumar, Thorsten Best und Roland Wester — Universität Innsbruck, Institut für Ionenphysik und Angewandte Physik, Österreich

The fast evolution in the fields of high precision spectroscopy and ion trapping during the last decades made it possible to gain high control of large quantum systems [1]. However, applying experimental methods as laser cooling and sympathetic cooling to more complex systems like molecules is difficult [2,3]. On the other hand, the development of multipole RF ion traps during the last 20 years made it possible to provide a large field free region which leads to weaker RF-heating as compared to low order Multipoles. Buffer gas cooling can be used to thermalize external as well as internal degrees of freedom of trapped molecular ions. By carrying out rotationally resolved photodetachment spectroscopy of cold trapped OH⁻ molecule, we have employed a new way of measuring rotational temperatures [4]. In this work, we apply this new scheme of measuring rotational and translation temperature by doing photodetachment spectroscopy on OD⁻. As an outlook, we present the status of rotational action THz spectroscopy of trapped molecular anions. This will give us new insight on rethermalisation processes and inelastic collision dynamics.

[1] T. Monz et. al., PRL 106, 130506 (2011) [2] A. Ostendorf et. al., PRL 97, 243005 (2006) [3] P. Staanum et. al., Nat.Phys. 6, 271-274 (2010) [4] R. Otto. et. al., PCCP 15, 612-18 (2013)