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License Type

Single Seat

Cluster

Unlimited

License Coverage

Single Research Group

Single Research Group

Single Research Group

Multi-Group  License

Site License

  • Single-seat license is designed to be used on a single standalone workstation with up to 32 cores.
  • Cluster license is intended to be used on smaller clusters with up to 256 cores (so on a cluster with 16 cores per node, Q-Chem could be licensed on up to 16 nodes).
  • Unlimited license is best suited for larger computer clusters or a larger number of individual workstations.


  • Single Research Group: Research under the supervision of a single principal investigator
  • Multi-Group License: Multiple academic research groups
  • Site License: All research groups on a single site

Include BrianQC module for NVIDIA GPU computing

1

2

4

8

16

32

64

Unlimited

GPU

GPUs

GPUs

GPUs

GPUs

GPUs

GPUs

GPUs


Q-Chem is an ab initio quantum chemistry software package for fast and accurate simulations of molecular systems, including electronic and molecular structure, reactivities, properties, and structure.





New Features in Q-Chem 6.4


Q-Chem 6.4 is here! Upgrade and enjoy improved performance and usability, as well as new tools for studying chemistry and spectroscopy. With these new features, you can deploy large-scale calculations and workflows, get more accurate results faster, and extend the scope of your research to include systems and research questions that were not previously accessible.


  • Spectroscopy modeling: 
  • Core-valence separation (CVS) scheme for ROCIS, XCIS, and QROCIS: Calculate accurate core-level spectra of open-shell systems
    Avik Ojha, John Herbert
  • Inner-valence projection option for EOM-IP/EE-CCSD solvers: Calculate high-lying excited/ionized states dominated by the removal of an inner-valence electron by using a CVS-like treatment.
    Wojtek Skomorowski
  • New ¥ÄSCF Driver: Run ¥ÄSCF calculations easier and more quickly, with a streamlined, simple interface and new useful tools for analysis of results
    Juanes Arias Martinez


  • Performance improvements and features for large systems:
  • Iterative CC-in-DFT embedding approach for property calculations
    Anthuan Ferino Pérez, Thomas Jagau
  • A two-step Cholesky decomposition for CC/EOM-CC energy and gradient: Provides faster CD calculations, especially for gradient
    Tingting Zhao, Anna Krylov
  • Stochastic RI-CC2 analytical gradients and derivative coupling (Additional Publication)
    Chongxiao Zhao, Wenjie Dou, Chenyang Li, Joonho Lee, Qi Ou


  • DFT developments:
  • New DFT methods: B97MV-D3s(BJ), B97MV-D4, wB97MV-D4, wB97MV-D3s(BJ), wB97XV-D3s(BJ), wB97XV-D4, Pr2SCAN69-D4, Pr2SCAN50-D4, wPr2SCAN50-D4, revDOD-PBEP86-D4, revDSD-PBEP86-D4, xDSD75-PBEP86-D4, wDSD72-PBEP86-D4, B2NC-PLYP, mPW2-PLYP, mPW2NC-PLYP, SOS0-PBE0-2
  • Support for B97-type functionals in TAO-DFT
    Shaozhi Li, Jeng-Da Chai
  • PBEh-3c and HF-3c Seminumerical Analytic Frequency: Provides similar accuracy and scaling to analytic Hessians. HF-3c especially is good for very efficient geometry optimizations (good accuracy for noncovalent interactions at the cost of minimal-basis Hartree-Fock). Also includes frequencies!
    Avik Ojha, John Herbert
  • Upgrade to DFT-D4
  • Mixed-reference SF-DFT (MR-SF-DFT): Improves accuracy and solves the spin-contamination problem in the original SF-TD-DFT
    Arnab Chakraborty, Zheng Pei, Yihan Shao, Anna Krylov


  • NEO developments:
  • NEO-CC2 method for excited states
    Jonathan Fetherolf, Sharon Hammes-Schiffer
  • NEO-CCSD(T) and NEO-CCSDTeep,epp methods
    Rowan Goudy, Sharon Hammes-Schiffer
  • Frozen core approximation for NEO methods
    Rowan Goudy, Sharon Hammes-Schiffer
  • Geometry optimization with finite-difference gradients for NEO-CC
    Rowan Goudy, Sharon Hammes-Schiffer

For a full list of new features and bugfixes, please review the official Q-Chem 6.4 release log here.