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 K2O2 (dipotassium dioxide)

using model chemistry: PBE1PBE/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1AG
Energy calculated at PBE1PBE/3-21G*
 hartrees
Energy at 0K-1342.911669
Energy at 298.15K 
HF Energy-1342.911669
Nuclear repulsion energy200.450227
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 PBE1PBE/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 Ag 833 799 0.00 35.20 0.13 0.24
2 Ag 262 252 0.00 21.05 0.05 0.10
3 B1u 459 441 133.27 0.00 0.73 0.84
4 B2u 203 195 84.84 0.00 0.00 0.00
5 B3g 459 441 0.00 8.28 0.75 0.86
6 B3u 72 69 89.97 0.00 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 1144.0 cm-1
Scaled (by 0.9598) Zero Point Vibrational Energy (zpe) 1098.0 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 PBE1PBE/3-21G*
ABC
0.82056 0.04388 0.04165

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/3-21G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
K1 0.000 0.000 2.220
K2 0.000 0.000 -2.220
O3 0.000 0.801 0.000
O4 0.000 -0.801 0.000

Atom - Atom Distances (Å)
  K1 K2 O3 O4
K14.44072.36052.3605
K24.44072.36052.3605
O32.36052.36051.6028
O42.36052.36051.6028

picture of dipotassium dioxide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
K1 O3 K2 140.308 K1 O4 K2 140.308
O3 K1 O4 39.692 O3 K2 O4 39.692
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 K 0.412      
2 K 0.412      
3 O -0.412      
4 O -0.412      


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 0.000 0.000
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -36.064 0.000 0.000
y 0.000 -41.228 0.000
z 0.000 0.000 1.979
Traceless
 xyz
x -16.440 0.000 0.000
y 0.000 -24.186 0.000
z 0.000 0.000 40.625
Polar
3z2-r281.251
x2-y25.164
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.161 0.000 0.000
y 0.000 6.396 0.000
z 0.000 0.000 10.427


<r2> (average value of r2) Å2
<r2> 213.289
(<r2>)1/2 14.604