Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 42: Ultracold atoms and molecules I (with Q)
A 42.5: Vortrag
Donnerstag, 20. März 2014, 15:00–15:15, DO26 208
Towards optical Feshbach resonances with 40Ca — •Evgenij Pachomow1, Max Kahmann1, Uwe Sterr1, Fritz Riehle1, and Eberhard Tiemann2 — 1Physikalisch Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig — 2Institut für Quantenoptik, Welfengarten 1, 30167 Hannover
Alkaline earth metals find applications in various fields of research and technology. Especially due to the narrow singlet-triplet intercombination line, photoassociation (PA) and optical Feshbach resonance (OFR) experiments have been the subject of research in the last decade. Compared to the other alkaline earth metals like strontium and ytterbium, where PA and OFR have already been performed, calcium offers an even narrower intercombination line of Γ / 2 π ≈ 374 Hz, which is supposed to solve loss problems at OFRs. We recently produced a quantum degenerate 40Ca gas using a two stage magneto-optical trap and subsequent forced evaporation cooling in an optical dipole trap. The interaction in the gas depends on the scattering length, which we plan to tune using the OFR. As a first step in the two molecular potentials c (Ω = 0+) and a (Ω = 1) correlating to the 3P+1S asymptote the six weakest bound photoassociation resonances were measured. Based on this data set these molecular potentials were fitted using a coupled channel model. On the basis of the experimentally observed spectra and the coupled channel model we investigate the feasibility of OFRs and their corresponding losses.
This work is funded by DFG through QUEST and RTG 1729.