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/STO-3G

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/STO-3G
 hartrees
Energy at 0K-481.757107
Energy at 298.15K 
HF Energy-481.686917
Nuclear repulsion energy100.668600
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/STO-3G
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 971 846 26.76 7.27 0.10 0.18
2 A1 419 365 12.00 1.24 0.75 0.86
3 B2 947 826 73.30 2.77 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 1168.2 cm-1
Scaled (by 0.8719) Zero Point Vibrational Energy (zpe) 1018.5 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/STO-3G
ABC
0.84679 0.32116 0.23285

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/STO-3G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.625
F2 0.000 1.175 -0.486
F3 0.000 -1.175 -0.486

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.61771.6177
F21.61772.3507
F31.61772.3507

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 93.196
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

State 2 (3B1)

Jump to S1C1
Energy calculated at MP2/STO-3G
 hartrees
Energy at 0K-481.637937
Energy at 298.15K-481.518107
HF Energy-481.586371
Nuclear repulsion energy96.224063
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/STO-3G
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 856 746 6.86      
2 A1 278 242 10.85      
3 B2 946 825 28.91      

Unscaled Zero Point Vibrational Energy (zpe) 1040.0 cm-1
Scaled (by 0.8719) Zero Point Vibrational Energy (zpe) 906.7 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 MP2/STO-3G
ABC
1.15306 0.24092 0.19928

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/STO-3G

Point Group is C2v

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability