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Required input data:

In addition to the above mentioned prerequisites ground-state energy calculations with the ricc2 module require only the data group $ricc2 (see Section 14.2.13), which defines the methods, convergence thresholds and limits for the number of iterations etc. If this data group is not set, the program will carry out a CC2 calculation. With the input
the ricc2 program will calculate the MP2 and CC2 ground-state energies, the latter converged to approximately $ 10^{-6}$a.u. The solution for the single-substitution cluster amplitudes is saved in the file CCR0--1--1---0, which can be kept for a later restart.