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: B3LYP/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3LYP/STO-3G
 hartrees
Energy at 0K-150.664639
Energy at 298.15K-150.668317
HF Energy-150.664639
Counterpoise corrected energy 
CP Energy at 298.15K 
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy37.545476
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 B3LYP/STO-3G
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' 3770 3365 101.20      
2 A' 3658 3265 32.75      
3 A' 3507 3130 490.30      
4 A' 2059 1838 3.51      
5 A' 1979 1766 7.27      
6 A' 629 562 48.30      
7 A' 398 356 96.54      
8 A' 336 300 84.38      
9 A" 3881 3463 17.59      
10 A" 941 840 67.14      
11 A" 382 341 4.61      
12 A" 115 103 96.00      

Unscaled Zero Point Vibrational Energy (zpe) 10828.2 cm-1
Scaled (by 0.8924) Zero Point Vibrational Energy (zpe) 9663.1 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 B3LYP/STO-3G
ABC
5.93780 0.26025 0.25857

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/STO-3G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.044 0.353 0.000
O2 0.011 1.392 0.000
O3 0.011 -1.259 0.000
H4 1.022 1.562 0.000
H5 -0.618 -1.488 0.775
H6 -0.618 -1.488 -0.775

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H11.03981.61221.55572.10362.1036
O21.03982.65111.02623.04763.0476
O31.61222.65112.99741.02321.0232
H41.55571.02622.99743.54863.5486
H52.10363.04761.02323.54861.5495
H62.10363.04761.02323.54861.5495

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 97.703 H1 O3 H5 103.661
H1 O3 H6 103.661 O2 H1 O3 176.962
H5 O3 H6 98.434
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.150      
2 O -0.365      
3 O -0.277      
4 H 0.113      
5 H 0.190      
6 H 0.190      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.641 -2.861 0.000 2.932
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -9.803 4.205 0.000
y 4.205 -12.361 0.000
z 0.000 0.000 -10.481
Traceless
 xyz
x 1.618 4.205 0.000
y 4.205 -2.219 0.000
z 0.000 0.000 0.601
Polar
3z2-r21.202
x2-y22.558
xy4.205
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.032 0.510 0.000
y 0.510 1.216 0.000
z 0.000 0.000 0.825


<r2> (average value of r2) Å2
<r2> 44.986
(<r2>)1/2 6.707