Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets
MO 19.17: Poster
Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof
High resolution spectroscopy on LiSr — •Erik Schwanke, Horst Knöckel, Silke Ospelkaus, and Eberhard Tiemann — QUEST und Inst. f. Quantenopik, Leibniz Universität Hannover
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 alkaline and alkaline earth atoms 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. We have successfully recorded the near infrared spectrum of LiSr. The molecules were created in a heatpipe and their thermal emission was recorded via a high resolution Fourier transform spectrometer. The assignment of the dense spectrum was facilitated by tuning a diode laser to a molecular line of the emission spectrum, resulting in the observation of P-R-doublets and a simple vibrational progression. We used the rotational constants from ab initio-calculations for a first guess of the rotational quantum numbers. Then we proceeded to take into account more transition lines from higher rotational and vibrational levels. Perturbations due to couplings between the 2 2 Σ + state and the 1 2 Π state have been observed and will be used to investigate the 2 Σ 1/2+– 1 2 Π1/2 and 2 Σ 1/2+– 1 2 Π3/2 couplings.
We will report on the status of the investigations.