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_opt/6-31+G**

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/6-31+G**
 hartrees
Energy at 0K-76.030310
Energy at 298.15K-76.032911
HF Energy-76.030310
Nuclear repulsion energy9.128980
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/6-31+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 A' 3983 3747 124.31      
2 A' 3864 3635 16.43      
3 A' 3805 3579 206.61      
4 A' 1650 1552 66.03      
5 A' 1633 1536 112.14      
6 A' 335 315 109.17      
7 A' 170 160 156.29      
8 A' 129 121 211.51      
9 A" 4006 3768 88.90      
10 A" 596 561 186.74      
11 A" 152 143 182.89      
12 A" 102 96 39.68      

Unscaled Zero Point Vibrational Energy (zpe) 10212.0 cm-1
Scaled (by 0.9406) Zero Point Vibrational Energy (zpe) 9605.4 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/6-31+G**
ABC
7.39684 0.20004 0.19979

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.078 0.607 0.000
O2 -0.004 1.572 0.000
O3 -0.004 -1.435 0.000
H4 0.897 1.909 0.000
H5 -0.452 -1.806 0.769
H6 -0.452 -1.806 -0.769

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.96882.04341.53792.58702.5870
O20.96883.00700.96233.49293.4929
O32.04343.00703.46290.96380.9638
H41.53790.96233.46294.02594.0259
H52.58703.49290.96384.02591.5372
H62.58703.49290.96384.02591.5372

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 105.574 H1 O3 H5 113.777
H1 O3 H6 113.777 O2 H1 O3 172.785
H5 O3 H6 105.775
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability