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All results from a given calculation for H2OH2O (water dimer)

using model chemistry: B3LYP/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 B3LYP/3-21G*
 hartrees
Energy at 0K-151.970908
Energy at 298.15K-151.974206
HF Energy-151.970908
Counterpoise corrected energy 
CP Energy at 298.15K 
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy37.263019
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/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' 3515 3382 21.77      
2 A' 3452 3321 0.82      
3 A' 3260 3136 333.87      
4 A' 1750 1684 41.09      
5 A' 1686 1622 58.26      
6 A' 560 539 40.49      
7 A' 300 288 184.19      
8 A' 205 197 282.32      
9 A" 3583 3447 9.66      
10 A" 891 857 151.81      
11 A" 230 221 137.40      
12 A" 83 80 94.39      

Unscaled Zero Point Vibrational Energy (zpe) 9756.9 cm-1
Scaled (by 0.962) Zero Point Vibrational Energy (zpe) 9386.1 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/3-21G*
ABC
6.30699 0.24304 0.24251

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.131 0.416 0.000
O2 0.007 1.416 0.000
O3 0.007 -1.330 0.000
H4 0.932 1.782 0.000
H5 -0.588 -1.443 0.791
H6 -0.588 -1.443 -0.791

Atom - Atom Distances (Å)
  H1 O2 O3 H4 H5 H6
H11.00801.75021.58372.14412.1441
O21.00802.74600.99493.02533.0253
O31.75022.74603.24660.99600.9960
H41.58370.99493.24663.65183.6518
H52.14413.02530.99603.65181.5816
H62.14413.02530.99603.65181.5816

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 104.497 H1 O3 H5 98.944
H1 O3 H6 98.944 O2 H1 O3 168.846
H5 O3 H6 105.121
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.309      
2 O -0.713      
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
  -0.493 -2.687 0.000 2.731
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -10.407 6.483 0.000
y 6.483 -13.674 0.000
z 0.000 0.000 -10.901
Traceless
 xyz
x 1.880 6.483 0.000
y 6.483 -3.019 0.000
z 0.000 0.000 1.139
Polar
3z2-r22.279
x2-y23.266
xy6.483
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.415 0.513 0.000
y 0.513 1.667 0.000
z 0.000 0.000 1.170


<r2> (average value of r2) Å2
<r2> 47.816
(<r2>)1/2 6.915