A quantal description of nuclear motion using coupled fifteen-state potential energy and spin-orbit coupling surfaces for studying the photodissociation of CH(2)OO to H(2)CO(X¹A(1)) + O¹D and H(2)CO(X¹A(1)) + O³P channels is presented. For the evaluation of surfaces, multireference electronic wave functions are employed. For the fully quantal description of the nuclear motion, we diabatize the PESs of the two and four lowest excited singlet and triplet states, respectively, within the three …