return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for H2O (Water)

using model chemistry: QCISD(TQ)/CEP-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at QCISD(TQ)/CEP-31G*
 hartrees
Energy at 0K-17.044640
Energy at 298.15K-17.045737
HF Energy-16.849956
Nuclear repulsion energy6.843974
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 QCISD(TQ)/CEP-31G*
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 3747 3747        
2 A1 1712 1712        
3 B2 3877 3877        

Unscaled Zero Point Vibrational Energy (zpe) 4667.8 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 4667.8 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 QCISD(TQ)/CEP-31G*
ABC
26.14789 14.07707 9.15068

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(TQ)/CEP-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.120
H2 0.000 0.771 -0.480
H3 0.000 -0.771 -0.480

Atom - Atom Distances (Å)
  O1 H2 H3
O10.97690.9769
H20.97691.5416
H30.97691.5416

picture of Water state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 O1 H3 104.192
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability