Radiative singlet-triplet transition properties from coupled-cluster response theory: The importance of the S-0 -> T-1 transition for the photodissociation of water at 193 nm
Expressions for first-order induced electronic transition matrix elements are derived within the coupled-cluster response theory framework. When combined with electric-dipole and spin-orbit operators, these matrix elements allow the calculation of radiative transition probabilities between singlet ground and triplet excited states. An implementation employing an atomic mean-field representation of