COUPLED CLUSTER APPROACH FOR STATIC PROPERTIES

We review the coupled cluster (CC) methods for calculating static properties for closed and open-shell systems. In the response-type formulations, properties of various orders are derived as energy derivatives of corresponding orders. Among various CC response versions, the stationary formulation has the important advantage of an inbuilt (2n+1) rule by which energy derivatives of higher order can be calculated using lower order derivative amplitudes. In this review we stress the importance and the difficulty of using a stationary formulation. We also discuss the first multideterminantal model space based CC response theory.