5 papers
Coupled cluster theory for positron binding in anions and polyatomic molecules
Rosario R. Riso, Jan Haakon M. Trabski, Federico Rossi +2
We present the positron coupled cluster singles and doubles (POS-CCSD) method to calculate positron binding energies in molecules. This framework treats electrons and positrons on…
Restoring the Conical Intersection Topology using Convex Density Functional Theory
Federico Rossi, Tommaso Giovannini, Henrik Koch
Conical intersections are central to the description of photophysics and photochemistry. Nevertheless, in non-adiabatic molecular dynamics simulations, they are fundamentally chall…
Convex Hartree-Fock theory: A simple framework for ground state conical intersections
Federico Rossi, Henrik Koch
Accurate modeling of conical intersections is crucial in nonadiabatic molecular dynamics, as these features govern processes such as radiationless transitions and photochemical rea…
SpinAdaptedSecondQuantization.jl 1.0 -- A Simple and Pedagogical Approach to Symbolic Quantum Chemistry
Marcus T. Lexander, Tor S. Haugland, Federico Rossi +1
The development of new electronic structure methods is a very time consuming and error prone process when done by hand. SpinAdaptedSecondQuantization is an open-source Julia packag…
Generalized coupled cluster theory for ground and excited state intersections
Federico Rossi, Eirik F. Kjønstad, Sara Angelico +1
Coupled cluster theory in the standard formulation is unable to correctly describe conical intersections among states of the same symmetry. This limitation has restricted the pract…