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The double minimum E(3)1Σu+ state in Cs2
W Jastrzebski1, P Kowalczyk2, J Szczepkowski1
1Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland.
Abstract:
The double minimum E1Σu+ state in caesium dimer was investigated by analysing spectra of the E1Σu+← X1Σg+ band system, simplified by polarisation labelling. A total of 6727 rotationally resolved transitions to levels situated in the inner well and above the internal barrier were identified and a potential energy curve allowing to reproduce their energies was constructed using the Fourier grid Hamiltonian and inverted perturbation approach methods. The unambiguity of the potential curve in view of lack of data related to levels located in the outer well is discussed.
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