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Q-Chem is a comprehensive ab initio quantum chemistry package for accurate predictions of molecular structures, reactivities, and vibrational, electronic and NMR spectra. The new release of Q-Chem 4.0 represents the state-of-the-art of methodology from the highest performance DFT/HF calculations to high level post-HF correlation methods:
Dispersion-corrected and double hybrid DFT functionals;
Faster algorithms for DFT, HF and coupled-cluster calculations;
Structures and vibrations of excited states with TD-DFT;
Methods for mapping complicated potential energy surfaces;
Efficient valence space models for strong correlation;
More choices for excited states, solvation and charge-transfer;
Effective Fragment Potential and QM/MM for large systems;
Shared-memory for multicores and implementations for GPU's.
For a complete list of new features, click here.
Q-Chem is available stand-alone here and as the fully integrated back-end of Spartan.