National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 22May 2022
NIST Standard Reference Database 101
IIExperimental data
IIICalculated data
IVData comparisons
VCost comparisons
VIInput and output files
VIITutorials and Units
VIIILinks to other sites
XOlder CCCBDB versions
XIII Vibrations
XIVReaction data
XVEntropy data
XVIBibliographic data
XVIIIon data
XVIIIBad calculations
XIXIndex of properties
XXH-bond dimers

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Calculated data

 1.Cartesians, bond lengths and angles bond lengths bond angles
  a.Bond lengths of isoelectronic diatomics
  b.Bond angles of isoelectronic triatomics
  c.Compare specific calculated bonds or angles
 2.Rotation and Moments of Inertia
  a. Rotational Constants rotational constants
  b. Products of moments of inertia moments of inertia
  c.Calculated moments of inertia moments of inertia
  d.Calculated inertial defects
  e.Calculated moments of inertia and eigenvectors
  f.Calculated second moments
 3.Point Group
 4.Bond orders from AIM analysis
 5.Average value of r squared ( <r2> )
 6.Number of conformers with calculated results
 7.Just show me a calculated geometry
B.Vibrations vibrations
 1. Vibrational frequencies
 2. Vibrational zero-point energies vibrational zero-point energy
 3.Vibrational scaling factors. vibrational scaling factors
  a.List vibrational scaling factors.
  b.List vibrational scaling factors and their uncertainties.
  c.Calculate a vibrational scaling factor for a given set of molecules.
  d.Why scale vibrational frequencies?
 4.Lookup molecules by their calculated vibrational frequencies.
 5.Compare reduced masses for a given vibrational mode.
 6.Animated vibrational modes.animated vibrational modes
 7.Bad Vibrational Frequency calculations
  a.By comparing HF and MP2 calculations
  b.By comparing with experiment
  c.By anharmonic constants
 8.Anharmonic Vibrational Frequency calculations
  a.Compare triatomic anharmonic vibrational constants
C.Entropies entropies
 1.Entropies and Integrated Heat Capacities at any temperature using calculated data.
 1.Energies in hartrees
  a. Energies (equilibrium, no zero-point energy)
  b. Energies (equilibrium, no zero-point energy) with heat correction to 298.15K
 2.Orbital Energies orbital energies
  a. HOMO-LUMO gap
  b. HOMO energy
  c. All Orbital Energies
 3.Barriers to Internal Rotation and Inversion internal rotation
  a. Single species
  b. Compare two or more species
  c. Single species with dipole moment displayed
 4.Nuclear repulsion Energies
 5.Correlation Energies
  a. Partial Correlation Energies
 6.Ionization Energies
  a. Electron Affinities
  b. Vertical Ionization Energies
 7.Conformation Energies
  a.Minimum Energy conformation
 8.Basis Set Extrapolation
 9.Excited Electronic States
 10.Singlet-Triplet Gap
 11.Proton Affinities
  1.Atomic charges
    a. Mulliken charges
    b. chelpg charges
    c. AIM charges
    d. Atom pair charge differences
    e. ESP charges
  2.Dipole moments dipole
    a. Dipole Moment angles
  3.Quadrupole moments quadrupole
  4.Polarizabilities polarizability
  5.Spin <S2>
  6.Spin Density
F.Information about calculations
  1.List showing how many calculations are done by method/basis set.
   a.List showing how many calculations are done by molecule.
  2. Calculations done for a given species.
  3. Number of basis functions used in a given calculation
  4. Calculated Diagnostics
  5. Calculated Electronic State Symmetries
G.Compare calculations
 1.Bond lengths bond lengths
   a.Bond lengths for one type of bond
   b.Selected bonds for several molecules
   c.Bond lengths of isoelectronic diatomics
   d.Bond angles of isoelectronic triatomics
 2.Compare calculated vibrational intensities vibrations
 3.Compare energy difference of a single point calculation
 4.Compare calculated transition state energies
 5.Compare dipoles calculated from atom charges dipoles
 6.Calculated properties for several species
  a.Energy in hartrees
 7.Compare vibrational frequencies for two calculations vibrations
 8.List of molecules sorted by size, as determined by <r2>
 9.DFT grid fineness comparisons
   a.Energy differences.
   b.Bond length differences.
   c.Point Group differences.
 10.Core correlation comparisons
   a.Energy differences.
   b.Bond length differences.
 11.Polarizability comparison
 12.Conformation comparison