MRCI studies on the electronic spectrum of GeO+

Multireference configuration interaction studies were performed on low-lying states of GeO+. The ground state (GS) was found to be X2Π, with 12Σ+ lying 0.22 eV higher. Based on the observed vertical ionization potentials, 12Σ+ had been assigned as GS in previous experimental work. Calculated Re, Te and De values, as well as ionization potentials, are in good agreement with experimental data available for X2Π, 12Σ+ and 22Σ+. Other predicted stable states of GeO+ are 14Π, 14Σ+, at 2.89 and 3.27 eV, respectively, and 12Φ, 22Δ, 22Σ−, 32Σ+ and 32Π, with Te's in the 5.1-5.4 eV region. The results obtained for GeO+ are related to those found for other isovalent diatomic cations.