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: CCD/cc-pVQZ

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 CCD/cc-pVQZ
 hartrees
Energy at 0K-399.296542
Energy at 298.15K-399.296159
HF Energy-399.227387
Nuclear repulsion energy17.322590
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 CCD/cc-pVQZ
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 29 29 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 14.7 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 14.7 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 CCD/cc-pVQZ
B
0.07264

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/cc-pVQZ

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Mg1 0.000 0.000 2.199
Mg2 0.000 0.000 -2.199

Atom - Atom Distances (Å)
  Mg1 Mg2
Mg14.3990
Mg24.3990

picture of Magnesium diatomic state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability