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)/6-31+G**

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)/6-31+G**
 hartrees
Energy at 0K-76.244775
Energy at 298.15K-76.245871
HF Energy-76.030301
Nuclear repulsion energy9.131911
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)/6-31+G**
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 3851 3851        
2 A1 1640 1640        
3 B2 3982 3982        

Unscaled Zero Point Vibrational Energy (zpe) 4736.3 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 4736.3 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)/6-31+G**
ABC
27.54602 14.25470 9.39363

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.117
H2 0.000 0.766 -0.468
H3 0.000 -0.766 -0.468

Atom - Atom Distances (Å)
  O1 H2 H3
O10.96360.9636
H20.96361.5319
H30.96361.5319

picture of Water state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 O1 H3 105.288
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability