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 SiF2 (Silicon difluoride)

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

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 MP2/6-31G**
 hartrees
Energy at 0K-488.304414
Energy at 298.15K 
HF Energy-487.883704
Nuclear repulsion energy99.654571
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 MP2/6-31G**
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 887 830 116.89 3.77 0.58 0.73
2 A1 337 316 20.54 0.81 0.35 0.52
3 B2 917 859 147.47 5.01 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 1070.5 cm-1
Scaled (by 0.9365) Zero Point Vibrational Energy (zpe) 1002.5 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 MP2/6-31G**
ABC
0.98666 0.28539 0.22136

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.579
F2 0.000 1.247 -0.451
F3 0.000 -1.247 -0.451

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.61711.6171
F21.61712.4936
F31.61712.4936

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 100.894
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

State 2 (3B1)

Jump to S1C1
Energy calculated at MP2/6-31G**
 hartrees
Energy at 0K-488.190588
Energy at 298.15K-488.070843
HF Energy-487.793612
Nuclear repulsion energy98.010454
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 MP2/6-31G**
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 841 787 57.02      
2 A1 276 259 20.91      
3 B2 980 918 136.31      

Unscaled Zero Point Vibrational Energy (zpe) 1048.6 cm-1
Scaled (by 0.9365) Zero Point Vibrational Energy (zpe) 982.0 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 MP2/6-31G**
ABC
1.41670 0.23580 0.20215

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

Point Group is C2v

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability