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 H2OH2O (water dimer)

using model chemistry: MP2/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-311G**
 hartrees
Energy at 0K-152.539152
Energy at 298.15K-152.541872
HF Energy-152.101156
Counterpoise corrected energy 
CP Energy at 298.15K 
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy36.775895
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 MP2/6-311G**
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' 3984 3786 65.46      
2 A' 3892 3698 12.18      
3 A' 3835 3644 230.91      
4 A' 1703 1619 41.93      
5 A' 1658 1575 65.05      
6 A' 385 366 76.10      
7 A' 190 181 2.37      
8 A' 144 137 328.98      
9 A" 3999 3800 59.68      
10 A" 652 619 154.78      
11 A" 155 147 153.57      
12 A" 83 78 38.28      

Unscaled Zero Point Vibrational Energy (zpe) 10339.7 cm-1
Scaled (by 0.9502) Zero Point Vibrational Energy (zpe) 9824.7 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 MP2/6-311G**
ABC
7.02980 0.21697 0.21665

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.068 0.551 0.000
O2 0.004 1.512 0.000
O3 0.004 -1.387 0.000
H4 0.922 1.779 0.000
H5 -0.524 -1.663 0.753
H6 -0.524 -1.663 -0.753

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.96351.93911.49662.41172.4117
O20.96352.89930.95703.30513.3051
O31.93912.89933.29740.95930.9593
H41.49660.95703.29743.80883.8088
H52.41173.30510.95933.80881.5050
H62.41173.30510.95933.80881.5050

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 102.396 H1 O3 H5 107.776
H1 O3 H6 107.776 O2 H1 O3 174.257
H5 O3 H6 103.345
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability