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(T)/6-31G*

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(T)/6-31G*
 hartrees
Energy at 0K-76.207902
Energy at 298.15K-76.209000
HF Energy-76.009594
Nuclear repulsion energy9.065702
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(T)/6-31G*
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 3724 3573        
2 A1 1741 1670        
3 B2 3854 3697        

Unscaled Zero Point Vibrational Energy (zpe) 4659.6 cm-1
Scaled (by 0.9593) Zero Point Vibrational Energy (zpe) 4470.0 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(T)/6-31G*
ABC
26.28635 14.30675 9.26444

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.120
H2 0.000 0.765 -0.479
H3 0.000 -0.765 -0.479

Atom - Atom Distances (Å)
  O1 H2 H3
O10.97100.9710
H20.97101.5292
H30.97101.5292

picture of Water state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 O1 H3 103.889
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability