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: B3PW91/6-31+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 B3PW91/6-31+G**
 hartrees
Energy at 0K-152.817988
Energy at 298.15K 
HF Energy-152.817988
Nuclear repulsion energy36.657654
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 B3PW91/6-31+G**
Rotational Constants (cm-1) from geometry optimized at B3PW91/6-31+G**
See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31+G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.061 0.542 0.000
O2 -0.003 1.512 0.000
O3 -0.003 -1.376 0.000
H4 0.904 1.832 0.000
H5 -0.463 -1.729 0.769
H6 -0.463 -1.729 -0.769

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.97161.91971.54122.45452.4545
O20.97162.88820.96173.36243.3624
O31.91972.88823.33450.96340.9634
H41.54120.96173.33453.89153.8915
H52.45453.36240.96343.89151.5389
H62.45453.36240.96343.89151.5389

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 105.728 H1 O3 H5 112.432
H1 O3 H6 112.432 O2 H1 O3 174.351
H5 O3 H6 106.019
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.424      
2 O -0.768      
3 O -0.765      
4 H 0.349      
5 H 0.380      
6 H 0.380      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.069 -3.068 0.000 3.068
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -12.094 6.855 0.000
y 6.855 -12.186 0.000
z 0.000 0.000 -12.067
Traceless
 xyz
x 0.032 6.855 0.000
y 6.855 -0.105 0.000
z 0.000 0.000 0.073
Polar
3z2-r20.146
x2-y20.092
xy6.855
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 53.070
(<r2>)1/2 7.285