Abstract

Most of the alkali dimers have been the subject of numerous spectroscopic investigations. For the lighter homonuclear diatomic molecules Li₂, Na₂, and K₂ spectroscopic constants have been precisely determined by laser excited photoluminescence spectroscopy. However, because of relatively small vibrational and rotational constants of the heavier species, the ground state molecular parameters and potential curves for Rb₂ and Cs₂ are not so easy to determine. We have started to make a Raman spectroscopic study of Rb₂ in order to determine independently from excited electronic state data the vibrational energy of the X¹Σ_g⁺ ground state.

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