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: PBEPBE_cp_opt/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at PBEPBE_cp_opt/6-31G*
 hartrees
Energy at 0K-76.322472
Energy at 298.15K-76.325461
HF Energy-76.322472
Nuclear repulsion energy9.005684
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 PBEPBE_cp_opt/6-31G*
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' 3711 3657 34.85      
2 A' 3626 3574 3.70      
3 A' 3483 3433 301.45      
4 A' 1716 1692 57.24      
5 A' 1680 1656 83.36      
6 A' 430 424 59.42      
7 A' 226 223 176.74      
8 A' 177 174 160.16      
9 A" 3747 3693 32.46      
10 A" 696 686 139.50      
11 A" 179 176 2.28      
12 A" 130 128 194.08      

Unscaled Zero Point Vibrational Energy (zpe) 9899.4 cm-1
Scaled (by 0.9857) Zero Point Vibrational Energy (zpe) 9757.9 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 PBEPBE_cp_opt/6-31G*
ABC
6.67684 0.21820 0.21776

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.096 0.521 0.000
O2 0.005 1.504 0.000
O3 0.005 -1.390 0.000
H4 0.933 1.805 0.000
H5 -0.556 -1.620 0.767
H6 -0.556 -1.620 -0.767

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.98771.91251.53372.36522.3652
O20.98772.89390.97583.26523.2652
O31.91252.89393.32730.97760.9776
H41.53370.97583.32733.81303.8130
H52.36523.26520.97763.81301.5333
H62.36523.26520.97763.81301.5333

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 102.722 H1 O3 H5 105.202
H1 O3 H6 105.202 O2 H1 O3 172.009
H5 O3 H6 103.296
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE_cp_opt/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.000      
2 O 0.000      
3 O -0.760      
4 H 0.000      
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
  -0.307 -2.754 0.000 2.771
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -5.772 3.255 0.000
y 3.255 -4.816 0.000
z 0.000 0.000 -4.326
Traceless
 xyz
x -1.200 3.255 0.000
y 3.255 0.233 0.000
z 0.000 0.000 0.968
Polar
3z2-r21.935
x2-y2-0.955
xy3.255
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.778 0.143 0.000
y 0.143 0.487 0.000
z 0.000 0.000 1.127


<r2> (average value of r2) Å2
<r2> 52.370
(<r2>)1/2 7.237