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/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-152.757088
Energy at 298.15K-152.759823
HF Energy-152.757088
Counterpoise corrected energy 
CP Energy at 298.15K 
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy36.674582
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/cc-pVTZ
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 3795 3769 55.97      
2 A 3768 3742 45.36      
3 A 3695 3669 6.87      
4 A 3544 3520 334.21      
5 A 1628 1616 38.80      
6 A 1602 1591 72.68      
7 A 663 658 86.25      
8 A 404 401 36.65      
9 A 196 195 83.71      
10 A 165 164 126.58      
11 A 146 145 211.33      
12 A 62 62 57.50      

Unscaled Zero Point Vibrational Energy (zpe) 9833.5 cm-1
Scaled (by 0.9931) Zero Point Vibrational Energy (zpe) 9765.6 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/cc-pVTZ
ABC
6.68842 0.21969 0.21924

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/cc-pVTZ

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.549 -0.003 0.073
O2 1.518 0.115 0.027
O3 -1.405 -0.120 -0.036
H4 1.849 -0.763 -0.213
H5 -1.683 0.199 0.839
H6 -1.625 0.614 -0.633

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.97791.95981.53342.36782.3676
O20.97792.93310.96863.30353.2509
O31.95982.93313.32160.97160.9716
H41.53340.96863.32163.80883.7612
H52.36783.30350.97163.80881.5301
H62.36763.25090.97163.76121.5301

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 103.952 H1 O3 H5 102.459
H1 O3 H6 102.445 O2 H1 O3 173.171
H5 O3 H6 103.891
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.211      
2 O -0.480      
3 O -0.395      
4 H 0.207      
5 H 0.228      
6 H 0.228      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.323 0.073 -0.014 2.324
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -12.595 -6.132 0.664
y -6.132 -12.323 0.068
z 0.664 0.068 -11.766
Traceless
 xyz
x -0.550 -6.132 0.664
y -6.132 -0.143 0.068
z 0.664 0.068 0.693
Polar
3z2-r21.386
x2-y2-0.272
xy-6.132
xz0.664
yz0.068


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.839 -0.246 0.026
y -0.246 2.193 -0.010
z 0.026 -0.010 2.098


<r2> (average value of r2) Å2
<r2> 52.232
(<r2>)1/2 7.227