Abstract
The complete active space (CASSCF) and the multiconfiguration second-order perturbation theory (CASPT2) calculations with 6-311++G(3df,3pd) gauss basis sets are performed for several electronic states of the methylthio neutral radical and its cation and anion. Twenty-two electronic states are optimized in the Cs point group. Through the vertical promotion calculations, the absorption spectral is simulated for the neutral radical. Furthermore, through the energy comparison between the neutral radical and relative ions, the ionization energy and the electronic absorption energy are understood adiabatically.
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