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/6-31G(2df,p)

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/6-31G(2df,p)
 hartrees
Energy at 0K-152.691864
Energy at 298.15K 
HF Energy-152.691864
Counterpoise corrected energy 
CP Energy at 298.15K 
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy36.893454
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/6-31G(2df,p)
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 3796 3757 45.53      
2 A 3778 3739 38.44      
3 A 3695 3657 7.14      
4 A 3548 3512 327.24      
5 A 1662 1645 48.06      
6 A 1631 1614 63.34      
7 A 668 662 64.06      
8 A 455 451 30.45      
9 A 229 226 131.12      
10 A 180 178 149.13      
11 A 147 146 188.88      
12 A 114i 113i 24.33      

Unscaled Zero Point Vibrational Energy (zpe) 9837.7 cm-1
Scaled (by 0.9897) Zero Point Vibrational Energy (zpe) 9736.4 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/6-31G(2df,p)
ABC
6.55979 0.22459 0.22389

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/6-31G(2df,p)

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.546 0.016 0.083
O2 1.516 0.116 0.015
O3 -1.400 -0.124 -0.023
H4 1.823 -0.791 -0.132
H5 -1.681 0.291 0.809
H6 -1.618 0.547 -0.691

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.97781.95441.52522.35872.3590
O20.97782.92670.96863.29943.2414
O31.95442.92673.29260.97170.9717
H41.52520.96863.29263.78573.7335
H52.35873.29940.97173.78571.5227
H62.35903.24140.97173.73351.5227

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 103.190 H1 O3 H5 102.150
H1 O3 H6 102.174 O2 H1 O3 172.617
H5 O3 H6 103.170
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.272      
2 O -0.624      
3 O -0.542      
4 H 0.278      
5 H 0.308      
6 H 0.308      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -1.840 0.194 -0.003 1.850
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -13.015 -5.782 0.040
y -5.782 -11.741 0.003
z 0.040 0.003 -11.438
Traceless
 xyz
x -1.426 -5.782 0.040
y -5.782 0.486 0.003
z 0.040 0.003 0.940
Polar
3z2-r21.879
x2-y2-1.275
xy-5.782
xz0.040
yz0.003


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.534 -0.261 0.003
y -0.261 1.947 -0.000
z 0.003 -0.000 1.840


<r2> (average value of r2) Å2
<r2> 50.972
(<r2>)1/2 7.139