Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 22: Posters 3: Experimental and Theoretical Techniques and High Resolution Spectroscopy

MO 22.16: Poster

Donnerstag, 8. März 2018, 16:15–18:15, Zelt West

Coupling of the 2 ² Σ ⁺ and 1 ² Π of LiSr — •Erik Schwanke, Julia Gerschmann, Horst Knöckel, Silke Ospelkaus, and Eberhard Tiemann — QUEST und Inst. f. Quantenopik, Leibniz Universität Hannover

Building on our spectroscopic study of the 2 ² Σ ⁺ – 1 ² Σ ⁺ system of LiSr, we modeled perturbations in the thermal emission spectrum as coupling between the F₁ and F₂ levels of the 2 ² Σ ⁺ state and the 1 ² Π_1/2 and 1 ² Π_3/2 states. The rotational and vibrational constants of the 2 ² Σ ⁺ state were derived from the thermal emission spectrum and laser-induced fluorescence in the near infrared.

Several large perturbations of the rotational ladders of v^′ = 0 and v^′ = 1 allow to estimate the rotational and vibrational constants of the ² Π state, while accompanying smaller perturbations hint at its spin-orbit coupling constant. A preliminary deperturbation of one of the larger instances led to more refined values for the rotational and vibrational constants of 1² Π, as well as a first estimate the coupling strength and the spin-rotation coupling in 2 ² Σ ⁺. Adding further perturbed states, a more global picture of the coupling constants and the 1² Π state will be derived.

We will report on the status of the investigations.