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: M06-2X/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 M06-2X/6-311G**
 hartrees
Energy at 0K-152.836853
Energy at 298.15K-152.839895
HF Energy-152.836853
Nuclear repulsion energy36.996237
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 M06-2X/6-311G**
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' 3973 3973 70.21      
2 A' 3883 3883 21.81      
3 A' 3818 3818 255.46      
4 A' 1648 1648 55.93      
5 A' 1624 1624 74.32      
6 A' 422 422 49.21      
7 A' 221 221 101.08      
8 A' 137 137 310.43      
9 A" 3981 3981 73.25      
10 A" 665 665 145.94      
11 A" 244 244 207.34      
12 A" 148 148 8.32      

Unscaled Zero Point Vibrational Energy (zpe) 10382.9 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 10382.9 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 M06-2X/6-311G**
ABC
6.92902 0.22272 0.22244

See section I.F.4 to change rotational constant units
Geometric Data calculated at M06-2X/6-311G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.173 0.526 0.000
O2 0.004 1.476 0.000
O3 0.004 -1.388 0.000
H4 0.876 1.874 0.000
H5 -0.558 -1.551 0.761
H6 -0.558 -1.551 -0.761

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.96531.92171.52052.32982.3298
O20.96532.86480.95813.17223.1722
O31.92172.86483.37680.96040.9604
H41.52050.95813.37683.79053.7905
H52.32983.17220.96043.79051.5229
H62.32983.17220.96043.79051.5229

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 104.473 H1 O3 H5 102.718
H1 O3 H6 102.718 O2 H1 O3 164.931
H5 O3 H6 104.898
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at M06-2X/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.260      
2 O -0.557      
3 O -0.514      
4 H 0.248      
5 H 0.282      
6 H 0.282      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.239 -2.168 0.000 2.181
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.059 6.645 0.000
y 6.645 -13.149 0.000
z 0.000 0.000 -11.438
Traceless
 xyz
x 1.234 6.645 0.000
y 6.645 -1.900 0.000
z 0.000 0.000 0.666
Polar
3z2-r21.332
x2-y22.090
xy6.645
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.734 0.313 0.000
y 0.313 2.110 0.000
z 0.000 0.000 1.685


<r2> (average value of r2) Å2
<r2> 51.463
(<r2>)1/2 7.174