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MO: Fachverband Molekülphysik

MO 12: Posters 2: Molecular Dynamics, Clusters, and High Resolution Spectroscopy

MO 12.16: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

High resolution spectroscopy on KCa — •Julia Gerschmann¹, Erik Schwanke¹, Horst Knöckel¹, Silke Ospelkaus¹, Asen Pashov², and Eberhard Tiemann¹ — ¹QUEST und Inst. f. Quantenopik, Leibniz Universität Hannover — ²Sofia Universität "St. Kliment Ohridski", Bulgarien

The mixed alkali-alkaline earth molecules have recently attracted the interest of the scientific community due to possible applications in the field of cold and ultracold molecules. The combination of an alkaline and an alkaline earth atom leads to molecules which have permanent electric and magnetic dipole moments and thus offer manipulation of their states by external fields. Several ab initio calculations have been published on various combinations of a group IA and a group IIA atom from which one expects ² Σ ⁺ – ² Σ ⁺ transitions in the near infrared. Experimentally, not so much is known about the molecular electronic states. The KCa molecules were created in a heatpipe oven and their thermal emission was recorded via a high resolution Fourier transform spectrometer. We have used laser induced fluorescence to assign the vibrational band heads of transitions from v′≤ 2 to v″≤ 3 in the 2 ² Σ ⁺ – 1 ² Σ ⁺ system. The resulting vibrational constants predicted other, moderately higher bandheads which can be observed in the emission spectrum. We are able to describe the rovibrational spectrum up to N = 160 of the v = 0 and v = 1 levels of the ground state of KCa. The rovibrational spectrum can be described by a Dunham series and one coefficient for the spin-rotation coupling. We will report on the status of the investigations.