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: HF/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 HF/6-311G**
 hartrees
Energy at 0K-152.102913
Energy at 298.15K 
HF Energy-152.102913
Counterpoise corrected energy 
CP Energy at 298.15K 
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy36.500880
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 HF/6-311G**
Rotational Constants (cm-1) from geometry optimized at HF/6-311G**
See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-311G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.014 0.617 0.000
O2 -0.005 1.562 0.000
O3 -0.005 -1.417 0.000
H4 0.897 1.828 0.000
H5 -0.415 -1.806 0.753
H6 -0.415 -1.806 -0.753

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.94512.03391.49862.57322.5732
O20.94512.97880.94043.47523.4752
O32.03392.97883.36770.94170.9417
H41.49860.94043.36773.93603.9360
H52.57323.47520.94173.93601.5065
H62.57323.47520.94173.93601.5065

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 105.275 H1 O3 H5 114.651
H1 O3 H6 114.651 O2 H1 O3 178.319
H5 O3 H6 106.236
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.277      
2 O -0.546      
3 O -0.511      
4 H 0.241      
5 H 0.269      
6 H 0.269      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.124 -3.224 0.000 3.227
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.403 6.410 0.000
y 6.410 -11.040 0.000
z 0.000 0.000 -11.213
Traceless
 xyz
x -0.276 6.410 0.000
y 6.410 0.267 0.000
z 0.000 0.000 0.009
Polar
3z2-r20.018
x2-y2-0.363
xy6.410
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> 55.111
(<r2>)1/2 7.424