configuration interaction

What are the Types of Configuration Interaction?

There are several types of CI, each with varying levels of complexity and accuracy:
Single Configuration Interaction (SCI): Considers single excitations of electrons.
Double Configuration Interaction (DCI): Includes both single and double excitations.
Multi-Configuration Interaction (MCI): Takes into account multiple excitations for a highly accurate description.
Complete Active Space CI (CAS-CI): Focuses on a subset of orbitals (the active space) where all possible excitations are considered.

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