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 H2O (Water)

using model chemistry: PBEPBEultrafine/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBEPBEultrafine/6-31G(2df,p)
 hartrees
Energy at 0K-76.339513
Energy at 298.15K-76.340610
HF Energy-76.339513
Nuclear repulsion energy9.076541
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 PBEPBEultrafine/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 A1 3706 3668 0.98 66.61 0.16 0.27
2 A1 1641 1624 63.97 4.28 0.60 0.75
3 B2 3814 3774 20.96 29.56 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4580.4 cm-1
Scaled (by 0.9897) Zero Point Vibrational Energy (zpe) 4533.2 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 PBEPBEultrafine/6-31G(2df,p)
ABC
25.61937 14.57954 9.29176

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.121
H2 0.000 0.757 -0.485
H3 0.000 -0.757 -0.485

Atom - Atom Distances (Å)
  O1 H2 H3
O10.97020.9702
H20.97021.5148
H30.97021.5148

picture of Water state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 O1 H3 102.646
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.581      
2 H 0.290      
3 H 0.290      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -1.817 1.817
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -7.150 0.000 0.000
y 0.000 -4.363 0.000
z 0.000 0.000 -5.922
Traceless
 xyz
x -2.008 0.000 0.000
y 0.000 2.174 0.000
z 0.000 0.000 -0.166
Polar
3z2-r2-0.331
x2-y2-2.788
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.685 0.000 0.000
y 0.000 1.223 0.000
z 0.000 0.000 0.986


<r2> (average value of r2) Å2
<r2> 5.365
(<r2>)1/2 2.316