What Does UCID Stand For?

UCID stands for Unrestricted CI With Single And Double Excitations

UCID, or Unrestricted Configuration Interaction with Single and Double Excitations, is a quantum chemistry method used to capture electron correlation effects in molecular systems. As an extension of configuration interaction, UCID incorporates both single and double excitations without restrictions on the reference wave function. This approach enhances the accuracy of electronic structure calculations, making it suitable for studying complex molecular interactions and providing a more comprehensive description of correlated electronic states in various chemical environments.