Mainz 2017 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

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

MO 12.20: Poster

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

High resolution spectroscopy on LiSr — •Erik Schwanke, Julia Gerschmann, 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 molecules.These molecules have permanent electric and magnetic dipole moments and thus offer manipulation of their states by external fields. Several ab initio calculations have been published for LiSr from which one expects ² Σ ⁺ – ² Σ ⁺ transitions in the near infrared. We have successfully recorded the near infrared spectrum of LiSr in a heatpipe oven. The thermal emission was recorded via a high resolution Fourier transform spectrometer. The assignment of the spectrum was facilitated by tuning a diode laser to an emission line, resulting in the observation of P-R-doublets and a simple vibrational progression in the fluorescence. Rotational constants from ab initio-calculations were used for a first guess of the rotational quantum numbers. Then we proceeded to take into account more transitions from higher rotational and vibrational levels. We are able to describe the rovibrational spectrum for the lowest vibrational states, deriving molecular parameters for the ground state 1 ² Σ ⁺. Perturbations due to couplings between the 2 ² Σ ⁺ state and the 1 ² Π state have been observed and are used to investigate the ² Σ _1/2⁺– 1 ² Π_1/2 and ² Σ _1/2⁺ – 1 ² Π_3/2 couplings. We will report on the status of the investigations.