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_cp/6-311+G(3df,2pd)

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/6-311+G(3df,2pd)
 hartrees
Energy at 0K-152.653599
Energy at 298.15K-152.646726
Nuclear repulsion energy 
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 MP2/6-311+G(3df,2pd)
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 3974 3776 100.24      
2 A 3961 3763 111.75      
3 A 3862 3669 15.30      
4 A 3775 3587 305.72      
5 A 1661 1578 40.55      
6 A 1631 1550 84.99      
7 A 649 617 112.09      
8 A 367 349 59.46      
9 A 182 173 101.35      
10 A 160 152 38.86      
11 A 156 148 184.54      
12 A 134 128 137.52      

Unscaled Zero Point Vibrational Energy (zpe) 10256.1 cm-1
Scaled (by 0.95) Zero Point Vibrational Energy (zpe) 9743.3 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 MP2/6-311+G(3df,2pd)
ABC
7.29280 0.21398 0.21395

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311+G(3df,2pd)

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 -0.563 0.000 0.035
O2 -1.515 0.000 -0.121
O3 1.385 0.000 0.109
H4 -1.901 0.000 0.756
H5 1.755 -0.759 -0.347
H6 1.755 0.759 -0.347

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.96561.94851.52032.46832.4683
O20.96562.90920.95763.36503.3650
O31.94852.90923.34870.95960.9596
H41.52030.95763.34873.89343.8934
H52.46833.36500.95963.89341.5177
H62.46833.36500.95963.89341.5177

picture of water dimer state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability