What are the Limitations of Configuration Interaction?
Despite its accuracy, CI has some limitations:
Computational Cost: CI methods are computationally intensive and can become impractical for large systems. Size Consistency: Some CI methods are not size-consistent, meaning the energy does not scale properly with the size of the system.
To mitigate these issues, researchers often use truncated CI methods or combine CI with other techniques like Density Functional Theory (DFT).
