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/6-31+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 HF/6-31+G**
 hartrees
Energy at 0K-152.070486
Energy at 298.15K-152.073211
HF Energy-152.070486
Counterpoise corrected energy-76.031227
CP Energy at 298.15K-76.033797
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy36.355126
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/6-31+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' 4246 3839 146.62      
2 A' 4145 3748 28.04      
3 A' 4100 3708 210.61      
4 A' 1760 1591 100.80      
5 A' 1742 1575 128.68      
6 A' 339 306 154.07      
7 A' 174 158 127.71      
8 A' 146 132 189.96      
9 A" 4262 3854 122.95      
10 A" 623 563 238.08      
11 A" 159 144 88.67      
12 A" 134 121 117.03      

Unscaled Zero Point Vibrational Energy (zpe) 10914.4 cm-1
Scaled (by 0.9042) Zero Point Vibrational Energy (zpe) 9868.8 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 HF/6-31+G**
ABC
7.93436 0.20215 0.20166

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.169 0.555 0.000
O2 0.004 1.490 0.000
O3 0.004 -1.404 0.000
H4 0.846 1.912 0.000
H5 -0.537 -1.577 0.756
H6 -0.537 -1.577 -0.756

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.94941.96681.51612.36992.3699
O20.94942.89480.94213.20503.2050
O31.96682.89483.42140.94540.9454
H41.51610.94213.42143.82823.8282
H52.36993.20500.94543.82821.5118
H62.36993.20500.94543.82821.5118

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 106.551 H1 O3 H5 103.279
H1 O3 H6 103.279 O2 H1 O3 165.181
H5 O3 H6 106.180
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.438      
2 O -0.784      
3 O -0.777      
4 H 0.358      
5 H 0.382      
6 H 0.382      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.345 -3.316 0.000 3.334
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -12.146 6.677 0.000
y 6.677 -10.833 0.000
z 0.000 0.000 -11.695
Traceless
 xyz
x -0.882 6.677 0.000
y 6.677 1.087 0.000
z 0.000 0.000 -0.205
Polar
3z2-r2-0.410
x2-y2-1.312
xy6.677
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.730 0.161 0.000
y 0.161 2.100 0.000
z 0.000 0.000 1.823


<r2> (average value of r2) Å2
<r2> 55.923
(<r2>)1/2 7.478