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 O2 (Oxygen diatomic)

using model chemistry: ROHF/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 3Σg
Energy calculated at ROHF/3-21G*
 hartrees
Energy at 0K-148.769086
Energy at 298.15K-148.769081
HF Energy-148.769086
Nuclear repulsion energy27.321259
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 ROHF/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 Σg 1619 1471 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 809.4 cm-1
Scaled (by 0.9085) Zero Point Vibrational Energy (zpe) 735.4 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 ROHF/3-21G*
B
1.37178

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

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.620
O2 0.000 0.000 -0.620

Atom - Atom Distances (Å)
  O1 O2
O11.2396
O21.2396

picture of Oxygen diatomic state 1 conformation 1
More geometry information
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at ROHF/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O 0.000      
2 O 0.000      


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 -9.705 0.000 0.000
y 0.000 -9.705 0.000
z 0.000 0.000 -10.717
Traceless
 xyz
x 0.506 0.000 0.000
y 0.000 0.506 0.000
z 0.000 0.000 -1.012
Polar
3z2-r2-2.023
x2-y20.000
xy0.000
xz0.000
yz0.000


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


<r2> (average value of r2) Å2
<r2> 12.419
(<r2>)1/2 3.524