Features include:
* Molecular electronic structure methods, analytic second derivatives:
- Restricted/unrestricted Hartree-Fock (RHF, UHF)
- Restricted Density Functional Theory (DFT) using many local,
non-local (gradient-corrected) or hybrid (local, non-local, and HF)
exchange-correlation potentials
* Molecular electronic structure methods, analytic gradients:
- Restricted open-shell Hartree-Fock (ROHF)
- Unrestricted Density Functional Theory (DFT)
- Second-order Moeller-Plesset perturbation theory (MP2), using RHF and UHF
reference
- Complete active space SCF (CASSCF)
* Molecular electronic structure methods, single-point energies:
- MP2 with resolution of the identity integral approximation (RI-MP2), using
RHF and UHF reference
- Coupled cluster singles and doubles, triples or pertubative triples (CCSD,
CCSDT, CCSD(T)), with RHF and UHF reference
- Configuration interaction (CISD, CISDT, and CISDTQ)
- Second-order approximate coupled-cluster singles doubles (CC2)
* Further molecular electronic structure features:
- Geometry optimization including transition state searches, constraints
and minimum energy paths
- Vibrational frequencies
- Equation-of-motion (EOM)-CCSD, EOM-CCSDT, EOM-CCSD(T), CC2,
Configuration-Interaction singles (CIS), time-dependent HF (TDHF) and
TDDFT, for excited states with RHF, UHF, RDFT, or UDFT reference
- Solvatisation using the Conductor-like screening model (COSMO) for RHF,
ROHF and DFT
- Hybrid calculations using the two- and three-layer ONIOM method
- Relativistic effects via spin-free and spin-orbit one-electron
Douglas-Kroll and zeroth-order regular approximations (ZORA) and
one-electron spin-orbit effects for DFT via spin-orbit potentials
* Pseudopotential plane-wave electronic structure:
- Pseudopotential Plane-Wave (PSPW), Projector Augmented Wave (PAW) or band
structure methods for calculating molecules, liquids, crystals, surfaces,
semi-conductors or metals
- Geometry/unit cell optimization including transition state searches
- Vibrational frequencies
- LDA, PBE96, and PBE0 exchange-correlation potentials (restricted and
unrestricted)
- SIC, pert-OEP, Hartree-Fock, and hybrid functionals (restricted and
unrestricted)
- Hamann, Troullier-Martins and Hartwigsen-Goedecker-Hutter norm-conserving
pseudopotentials with semicore corrections
- Wavefunction, density, electrostatic and Wannier plotting
- Band structure and density of states generation
* Car-Parrinello ab-initio molecular dynamics:
- Constant energy and constant temperature dynamics
- Verlet algorithm for integration
- Geometry constraints in cartesian coordinates
* Classical molecular dynamics:
- Single configuration energy evaluation
- Energy minimization
- Molecular dynamics simulation
- Free energy simulation (multistep thermodynamic perturbation (MSTP) or
multiconfiguration thermodynamic integration (MCTI) methods with options of
single and/or dual topologies, double wide sampling, and separation-
shifted scaling)
- Force fields providing effective pair potentials, first order
polarization, self consistent polarization, smooth particle mesh Ewald
(SPME), periodic boundary conditions and SHAKE constraints
* Mixed quantum-classical:
- Mixed quantum-mechanics and molecular-mechanics (QM/MM) minimizations and
molecular dynamics simulations
- Quantum molecular dynamics simulation by using any of the quantum
mechanical methods capable of returning gradients.
