**CFOUR, Coupled-Cluster techniques for Computational Chemistry**, a quantum-chemical program package by

J.F. Stanton, J. Gauss, L. Cheng, M.E. Harding, D.A. Matthews, P.G. Szalay

with contributions from A.A. Auer, R.J. Bartlett, U. Benedikt, C. Berger, D.E. Bernholdt, Y.J. Bomble, O. Christiansen, F. Engel, R. Faber, M. Heckert, O. Heun, C. Huber, T.-C. Jagau, D. Jonsson, J. Jusélius, K. Klein, W.J. Lauderdale, F. Lipparini, T. Metzroth, L.A. Mück, D.P. O'Neill, D.R. Price, E. Prochnow, C. Puzzarini, K. Ruud, F. Schiffmann, W. Schwalbach, C. Simmons, S. Stopkowicz, A. Tajti, J. Vázquez, F. Wang, J.D. Watts
and the integral packages
*MOLECULE* (J. Almlöf and P.R. Taylor), *PROPS* (P.R. Taylor), *ABACUS* (T. Helgaker, H.J. Aa. Jensen, P. Jørgensen, and J. Olsen), and ECP routines by A. V. Mitin and C. van Wüllen.
For the current version, see http://www.cfour.de.

**Parallel version of CFOUR**

`M.E. Harding, T. Metzroth, J. Gauss, and A.A. Auer,`

`J. Chem. Theor. Comp. 4, 64 (2008)`

**Quantum chemical methods**

**Basis sets**

**Analytic energy derivatives**

** Calculation of molecular properties**

** EOM and CC-LR methods for excited, ionized, and electron-attached states**

**Additivity and basis-set extrapolation schemes**

**Relativistic effects**

**Diagonal Born-Oppenheimer corrections **

**Special topics**