return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for H2O (Water)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CBS-Q
 hartrees
Energy at 0K-76.336499
Energy at 298.15K-76.332720
HF Energy-76.006573
Nuclear repulsion energy9.333210
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at CBS-Q
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 4086 4086 11.25 79.12 0.20 0.33
2 A1 1836 1836 108.10 7.39 0.51 0.67
3 B2 4199 4199 49.04 41.22 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5060.1 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 5060.1 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at CBS-Q
ABC
28.04789 14.20010 9.42726

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.112
H2 0.000 0.758 -0.448
H3 0.000 -0.758 -0.448

Atom - Atom Distances (Å)
  O1 H2 H3
O10.94240.9424
H20.94241.5166
H30.94241.5166

picture of Water state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 O1 H3 107.157
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability