return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for SiF2 (Silicon difluoride)

using model chemistry: MP3=FULL/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
2 1 yes C2V 3B1

State 1 (1A1)

Jump to S2C1
Energy calculated at MP3=FULL/6-31G*
 hartrees
Energy at 0K-488.320263
Energy at 298.15K-488.200607
HF Energy-487.884216
Nuclear repulsion energy100.196028
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 MP3=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 A1 909 853 130.27      
2 A1 347 326 22.27      
3 B2 936 878 161.18      

Unscaled Zero Point Vibrational Energy (zpe) 1096.0 cm-1
Scaled (by 0.9383) Zero Point Vibrational Energy (zpe) 1028.4 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 MP3=FULL/6-31G*
ABC
0.98679 0.29008 0.22418

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP3=FULL/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.576
F2 0.000 1.237 -0.448
F3 0.000 -1.237 -0.448

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.60571.6057
F21.60572.4748
F31.60572.4748

picture of Silicon difluoride state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 100.827
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

State 2 (3B1)

Jump to S1C1
Energy calculated at MP3=FULL/6-31G*
 hartrees
Energy at 0K-488.201884
Energy at 298.15K-488.082149
HF Energy-487.794076
Nuclear repulsion energy98.478840
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 MP3=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 A1 858 805 62.43      
2 A1 281 264 22.30      
3 B2 996 935 143.88      

Unscaled Zero Point Vibrational Energy (zpe) 1067.6 cm-1
Scaled (by 0.9383) Zero Point Vibrational Energy (zpe) 1001.8 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 MP3=FULL/6-31G*
ABC
1.40742 0.23927 0.20450

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP3=FULL/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.486
F2 0.000 1.355 -0.378
F3 0.000 -1.355 -0.378

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.60721.6072
F21.60722.7095
F31.60722.7095

picture of Silicon difluoride state 2 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 114.902
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability