Berlin 2005 – scientific programme
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Q: Quantenoptik und Photonik
Q 38: Fallen & Kühlung I
Q 38.2: Talk
Tuesday, March 8, 2005, 11:30–11:45, HU 2002
Detection of Ultracold Groundstate Molecules with a Time of Flight Mass Spectrometer — •Stephan Kraft1, Peter Staanum1,2, Jörg Lange1, Roland Wester1, Andrea Fioretti3, and Matthias Weidemüller1 — 1Physikalisches Institut, Universität Freiburg, 79104 Freiburg — 2Institut für Quantenoptik, Universität Hannover, 30167 Hannover — 3Istituto per i Processi Chimico-Fisici, C.N.R., 56124 Pisa, Italy
In the field of ultracold molecules selective detection of vibrational levels in the 1Σ and 3Σ electronic ground states is a crucial factor. For this purpose we have implemented in our Li and Cs photoassociation experiment a pulsed dye laser for state-selected resonant enhanced multiphoton ionisation (REMPI) detection in combination with a Wiley McLaren type time of flight mass spectrometer [1]. Using electrodes with perfect optical access for themagneto-optical trap we have achived a mass resolution of about M/Δ M ∼ 200.
With this resolution we are able to distinguish easily between atomic Cs+ (mass: 133 u) and molecular LiCs+ (mass: 140 u) ions. In this talk, we describe the new TOF spectrometer and present results of the detection of ultracold ground state molecules.
[1] W. C. Wiley and I. H. McLaren, Rev. Sci. Inst. 26,1150 (1955)