## Shape resonance of sulphur dioxide anion excited states using the CAP-CIP-FSMRCCSD method

2020-02-14T09:28:17Z (GMT) by

We have studied the shape resonance of excited states of sulphur dioxide (SO2) anion by using the correlated independent particle Fock space multi-reference coupled cluster (CAP-CIP-FSMRCCSD) method augmented by complex absorption potential. These resonant states have been trapped experimentally in recent years by electron collision. In particular, we have investigated e-SO2 scattering and computed the negative-ion resonance states of the ${SO}_{2}^{-}$ anion responsible for the two resonances around 4.45 and 6.56 eV and compared the results with the existing experimental observations. From the computational results using the CAP-CIP-FSMRCCSD method, it has been observed that both the resonances near 4.45 and 6.56 eV result from A1 symmetries.