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• W2752338593 abstract "We compute four-dimensional diabatic potential energy surfaces and transition dipole moment surfaces of O2–O2, relevant for the theoretical description of collision-induced absorption in the forbidden X3Σg− → a1Δg and X3Σg− → b1Σg+ bands at 7883 cm−1 and 13 122 cm−1, respectively. We compute potentials at the multi-reference configuration interaction (MRCI) level and dipole surfaces at the MRCI and complete active space self-consistent field (CASSCF) levels of theory. Potentials and dipole surfaces are transformed to a diabatic basis using a recent multiple-property-based diabatization algorithm. We discuss the angular expansion of these surfaces, derive the symmetry constraints on the expansion coefficients, and present working equations for determining the expansion coefficients by numerical integration over the angles. We also present an interpolation scheme with exponential extrapolation to both short and large separations, which is used for representing the O2–O2 distance dependence of the angular expansion coefficients. For the triplet ground state of the complex, the potential energy surface is in reasonable agreement with previous calculations, whereas global excited state potentials are reported here for the first time. The transition dipole moment surfaces are strongly dependent on the level of theory at which they are calculated, as is also shown here by benchmark calculations at high symmetry geometries. Therefore, ab initio calculations of the collision-induced absorption spectra cannot become quantitatively predictive unless more accurate transition dipole surfaces can be computed. This is left as an open question for method development in electronic structure theory. The calculated potential energy and transition dipole moment surfaces are employed in quantum dynamical calculations of collision-induced absorption spectra reported in Paper II [T. Karman et al., J. Chem. Phys. 147, 084307 (2017)]." @default.
• W2752338593 created "2017-09-15" @default.
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• W2752338593 date "2017-08-28" @default.
• W2752338593 modified "2023-10-02" @default.
• W2752338593 title "Potential energy and dipole moment surfaces of the triplet states of the O2(X3Σg−) − O2(X3Σg−,a1Δg,b1Σg+) complex" @default.
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• W2752338593 doi "https://doi.org/10.1063/1.4990661" @default.
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