- Calculation of MP2 energies and/or MP2 gradients for RHF and UHF wave functions.
- The frozen core approximation (possibility to exclude low-lying orbitals from the MP2 treatment) is implemented only for MP2 energies.
- Exploitation of symmetry of all point groups.

- Calculation of MP2 energies and/or gradients for RHF and UHF wave functions within the efficient RI-approximation.
- The frozen core approximation is implemented for both RI-MP2 energies and gradients.
- RI-MP2 needs optimised auxiliary basis sets, which are
available for all
`TURBOMOLE`standard basis sets (SVP, TZVP, TZVPP, QZVPP) as well as for the (aug-)cc-p(wC)VXZ (X = D, T, Q, 5) basis sets series (for Al-Ar also for the (aug-)cc-p(wC)V(X+d)Z series). - Exploitation of symmetry of all point groups.

- Includes the above
`rimp2`functionalities. - Runs parallel.
- See Chapter 9 for further details.