Performance of quasi-degenerate scaled opposite spin perturbation corrections to single excitation configuration interaction for excited state structures and excitation energies with application to the Stokes shift of 9-methyl-9,10-dihydro-9-silaphe

Performance of quasi-degenerate scaled opposite spin perturbation corrections to single excitation configuration interaction for excited state structures and excitation energies with application to the Stokes shift of 9-methyl-9,10-dihydro-9-silaphe