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arXiv · 1712.05309

Laser and Fourier transform spectroscopy of $^7$Li$^{88}$Sr

Erik Schwanke·Horst Knöckel·Asen Pashov·Alexander Stein·Silke Ospelkaus·Eberhard Tiemann
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Abstract

LiSr was produced in a heat-pipe oven and its thermal emission spectrum around 9300 cm$^{-1}$ was recorded by a high resolution Fourier transform spectrometer. In addition, selected lines of the spectrum of deeply bound vibrational levels of the $1^2Σ^+$ and $2^2Σ^+$ states were studied using laser excitation to facilitate the assignment of the lines. The ground state could be described for $v^{\prime\prime} =$ 0 - 2, $N^{\prime\prime}$ up to 105 and the $2^2Σ^+$ state for $v^{\prime} = 0$ up to $N^\prime = 68$. For both states, Dunham coefficients, spin-rotation parameters and potential energy curves were evaluated. A coupling of the $2^2Σ^+$ state to the $1^2Π$ state was observed, allowing a local description with Dunham coefficients of the $1^2Π$ state and an approximate evaluation of the coupling strength.

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Erik Schwanke, Horst Knöckel, Asen Pashov, Alexander Stein, Silke Ospelkaus, Eberhard Tiemann. 2017-12-14. Laser and Fourier transform spectroscopy of $^7$Li$^{88}$Sr. https://doi.org/10.1088/1361-6455%2Faa8ca0

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