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All results from a given calculation for H2OH2O (water dimer)

using model chemistry: MP2_cp_opt/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2_cp_opt/6-31G*
 hartrees
Energy at 0K-76.009734
Energy at 298.15K-76.012541
HF Energy-76.009734
Nuclear repulsion energy9.077716
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 MP2_cp_opt/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 A' 3884 3663 85.51      
2 A' 3775 3559 9.49      
3 A' 3716 3505 198.66      
4 A' 1771 1670 85.34      
5 A' 1736 1637 103.56      
6 A' 375 353 110.32      
7 A' 193 182 175.00      
8 A' 156 147 160.70      
9 A" 3908 3686 61.25      
10 A" 645 608 201.12      
11 A" 165 156 31.10      
12 A" 128 121 172.31      

Unscaled Zero Point Vibrational Energy (zpe) 10225.4 cm-1
Scaled (by 0.943) Zero Point Vibrational Energy (zpe) 9642.5 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 MP2_cp_opt/6-31G*
ABC
7.15067 0.20454 0.20452

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2_cp_opt/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.049 0.585 0.000
O2 -0.001 1.559 0.000
O3 -0.001 -1.418 0.000
H4 0.925 1.839 0.000
H5 -0.477 -1.775 0.766
H6 -0.477 -1.775 -0.766

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.97492.00391.52912.53622.5362
O20.97492.97690.96773.45323.4532
O32.00392.97693.38580.96960.9696
H41.52910.96773.38583.95063.9506
H52.53623.45320.96963.95061.5318
H62.53623.45320.96963.95061.5318

picture of water dimer state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 O2 H4 103.838 H1 O3 H5 112.327
H1 O3 H6 112.327 O2 H1 O3 175.594
H5 O3 H6 104.351
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability