The electronic spectra of neutral PaO and PaO2 and their mono- (PaO+, PaO2 +) and dications (PaO2+, PaO2 2+) were studied by performing multiconfigurational quantum chemical calculations at the CASSCF/CASPT2 level of theory taking into account spin-orbit coupling. Including the protactinium 7s, 6d, and 5f orbitals as well as selected orbitals of oxygen in the active space, the vertical excitation energies at the ground-state geometries have been computed up to ca. 36,000 cm-1. The gas-phase electronic spectra at 298 and 3,000 K were evaluated on the basis of the computed oscillator strengths.
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Acknowledgments The 7th Framework Programme of the European Commission (Collaboration Project No. 211690), the Hungarian Scientific Research Foundation (OTKA No. 75972), Eusko Jaurlaritza (GIC07/85 IT-330-07), the Spanish Office for Scientific Research (CTQ2011-27374), and Director, the Office of Basic Energy Sciences, the U.S. Department of Energy under Contract No. USDOE/ DESC002183 (LG) are acknowledged for financial support.
- CASPT2 calculations
- Electronic spectra
- Vertical excitations