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computer programs
A new program, CLUSTERGEN, for molecular cluster generation is introduced. CLUSTERGEN provides the quantum mechanics/molecular mechanics (QM/MM) input files for program packages such as ADF [Baerends et al. (2012). Vrije Universiteit, Amsterdam, The Netherlands] and GAUSSIAN [Frisch et al. (2009). Gaussian Inc., Pittsburgh, Pennsylvania, USA]. Additionally, it prints out a standard CRYSTAL [Dovesi et al. (2009). University of Turin, Italy] input and, in general, facilitates file-format manipulation. The CLUSTERGEN program is supported by an extensive manual and a user-friendly graphical interface. The code is freely available and carefully commented, which makes it easily modifiable. Exemplary applications of CLUSTERGEN concerning QM/MM calculations and derivation of nucleus-independent chemical shift indices are demonstrated.