The states 11Σu+, 11Πu and 21Σu+ of Sr2 studied by Fourier-transform spectroscopy*
Institut für Quantenoptik, Leibniz Universität
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Published online: 13 September 2011
A high resolution study of the electronic states 11Σu+ and 11Πu which belong to the asymptote 41D + 51S and of the state 2(A)1Σu+, which correlates to the asymptote 51P + 51S, is performed by Fourier-transform spectroscopy of fluorescence progressions induced by single frequency laser excitation. Precise descriptions of the potentials up to 2000 cm-1 above the bottom are derived and compared to currently available ab initio calculations. Especially for the state 11Σu+ large deviations are found. Rather weak and local perturbations are observed for the states 11Πu and 21Σu+, while a strong coupling of the state 11Σu+ to the component Ω = 0u+ of the state 13Πu, which belongs to the asymptote 53P + 51S, is indicated.
Supplementary online material is available at www.epj.org
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011