The states 11Σ u + , 11Πu and 21Σ u + of Sr2 studied by Fourier-transform spectroscopy
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A high resolution study of the electronic states 11Σ u + and 11 Π u which belong to the asymptote 41D + 51S and of the state 11Σ u + , 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 11Σ u + large deviations are found. Rather weak and local perturbations are observed for the states 11 Π u and 21Σ u + , while a strong coupling of the state 11Σ u + to the component Ω=0 u + of the state 13 Π u , which belongs to the asymptote 53P + 51S, is indicated.
KeywordsDunham 86Sr Internuclear Distance Potential Energy Curve Potential Minimum
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