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 Mg2 (Magnesium diatomic)

using model chemistry: PBEPBE/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 1Σg
Energy calculated at PBEPBE/6-31G*
 hartrees
Energy at 0K-399.865595
Energy at 298.15K-399.865351
HF Energy-399.865595
Nuclear repulsion energy21.781181
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 PBEPBE/6-31G*
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 104 103 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 52.1 cm-1
Scaled (by 0.9857) Zero Point Vibrational Energy (zpe) 51.4 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 PBEPBE/6-31G*
B
0.11485

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/6-31G*

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Mg1 0.000 0.000 1.749
Mg2 0.000 0.000 -1.749

Atom - Atom Distances (Å)
  Mg1 Mg2
Mg13.4985
Mg23.4985

picture of Magnesium diatomic state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Mg 0.000      
2 Mg 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 -24.794 0.000 0.000
y 0.000 -24.794 0.000
z 0.000 0.000 -27.342
Traceless
 xyz
x 1.274 0.000 0.000
y 0.000 1.274 0.000
z 0.000 0.000 -2.548
Polar
3z2-r2-5.097
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 17.969 0.000 0.000
y 0.000 17.969 0.000
z 0.000 0.000 36.266


<r2> (average value of r2) Å2
<r2> 89.453
(<r2>)1/2 9.458