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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 18.2.14), 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
$ricc2
  mp2
  cc2
  conv=6
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.



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