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: B3LYPultrafine/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3LYPultrafine/3-21G
 hartrees
Energy at 0K-151.970909
Energy at 298.15K-151.974200
HF Energy-151.970909
Counterpoise corrected energy-151.959597
CP Energy at 298.15K-151.962675
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy37.246927
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 B3LYPultrafine/3-21G
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 3583 3458 9.72      
2 A 3515 3391 22.50      
3 A 3452 3331 0.85      
4 A 3261 3146 334.37      
5 A 1750 1689 41.65      
6 A 1685 1626 58.55      
7 A 889 858 153.48      
8 A 555 536 42.93      
9 A 296 286 168.70      
10 A 226 218 130.41      
11 A 207 199 287.69      
12 A 81 78 99.67      

Unscaled Zero Point Vibrational Energy (zpe) 9750.5 cm-1
Scaled (by 0.9649) Zero Point Vibrational Energy (zpe) 9408.2 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 B3LYPultrafine/3-21G
ABC
6.31331 0.24263 0.24211

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYPultrafine/3-21G

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.070 0.511 0.000
O2 0.007 1.504 0.000
O3 0.007 -1.396 0.000
H4 0.942 1.833 0.000
H5 -0.560 -1.603 0.792
H6 -0.560 -1.603 -0.792

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H10.99491.90741.58402.34292.3429
O20.99492.89930.99183.25523.2552
O31.90742.89933.36110.99540.9954
H41.58400.99183.36113.83193.8319
H52.34293.25520.99543.83191.5841
H62.34293.25520.99543.83191.5841

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 105.751 H1 O3 H5 103.087
H1 O3 H6 103.087 O2 H1 O3 174.489
H5 O3 H6 105.436
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYPultrafine/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.309      
2 O -0.712      
3 O -0.601      
4 H 0.297      
5 H 0.354      
6 H 0.354      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.806 0.223 0.076 2.815
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -12.359 -6.350 -2.042
y -6.350 -11.574 -0.220
z -2.042 -0.220 -10.971
Traceless
 xyz
x -1.086 -6.350 -2.042
y -6.350 0.091 -0.220
z -2.042 -0.220 0.995
Polar
3z2-r21.991
x2-y2-0.784
xy-6.350
xz-2.042
yz-0.220


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.762 -0.465 -0.149
y -0.465 1.306 0.043
z -0.149 0.043 1.183


<r2> (average value of r2) Å2
<r2> 47.882
(<r2>)1/2 6.920