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/aug-cc-pVTZ

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/aug-cc-pVTZ
 hartrees
Energy at 0K-152.665490
Energy at 298.15K-152.658592
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/aug-cc-pVTZ
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' 3915 3731 115.25      
2 A' 3814 3635 11.12      
3 A' 3720 3545 294.67      
4 A' 1650 1572 36.34      
5 A' 1629 1552 87.24      
6 A' 358 341 52.62      
7 A' 183 174 140.69      
8 A' 153 146 138.62      
9 A" 3936 3751 97.48      
10 A" 629 599 92.14      
11 A" 147 140 68.04      
12 A" 127 121 99.92      

Unscaled Zero Point Vibrational Energy (zpe) 10129.9 cm-1
Scaled (by 0.9529) Zero Point Vibrational Energy (zpe) 9652.8 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/aug-cc-pVTZ
ABC
7.26329 0.21401 0.21397

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/aug-cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.093 0.555 0.000
O2 -0.001 1.519 0.000
O3 -0.001 -1.389 0.000
H4 0.901 1.849 0.000
H5 -0.488 -1.720 0.761
H6 -0.488 -1.720 -0.761

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.96851.94651.52502.46872.4687
O20.96852.90820.96043.36293.3629
O31.94652.90823.36120.96220.9622
H41.52500.96043.36123.90463.9046
H52.46873.36290.96223.90461.5223
H62.46873.36290.96223.90461.5223

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