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All results from a given calculation for Al2 (Aluminum diatomic)

using model chemistry: MP2=FULL/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 3Σg
2 1 yes D*H 1Σg

State 1 (3Σg)

Jump to S2C1
Energy calculated at MP2=FULL/6-31G*
 hartrees
Energy at 0K-483.832871
Energy at 298.15K-483.832529
HF Energy-483.726190
Nuclear repulsion energy36.217515
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 MP2=FULL/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 366 345 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 182.9 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 172.3 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 MP2=FULL/6-31G*
B
0.20494

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G*

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 1.235
Al2 0.000 0.000 -1.235

Atom - Atom Distances (Å)
  Al1 Al2
Al12.4693
Al22.4693

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

Electronic state

Charges, Dipole, Quadrupole and Polarizability

State 2 (1Σg)

Jump to S1C1
Energy calculated at MP2=FULL/6-31G*
 hartrees
Energy at 0K-483.815117
Energy at 298.15K-483.814619
Nuclear repulsion energy30.212498
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 MP2=FULL/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 236 223 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 118.2 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 111.3 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 MP2=FULL/6-31G*
B
0.14261

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G*

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Al1 0.000 0.000 1.480
Al2 0.000 0.000 -1.480

Atom - Atom Distances (Å)
  Al1 Al2
Al12.9601
Al22.9601

picture of Aluminum diatomic state 2 conformation 1
More geometry information
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability