Abstract:
Bound state theories can be used for quasi-bound, resonant or decay states by modification of Hamiltonian through complex scaling or by addition of complex absorbing potential (CAP). We present here the coupled-cluster method by addition of CAP and describe resonant states obtained by electron-molecule collision and inter-atomic coulombic decay(ICD) states, which have been observed experimentally. We present latest results of excited state resonances of SO2 anion using CAP Multi-reference coupled-cluster method and earlier results of resonance and ICD through the above method as well as CAP -Equation of motion coupled-cluster approach.