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: PBEPBE/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 PBEPBE/STO-3G
 hartrees
Energy at 0K-482.584241
Energy at 298.15K 
HF Energy-482.584241
Nuclear repulsion energy97.866497
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 PBEPBE/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 882 806 19.32 6.96 0.12 0.22
2 A1 367 336 5.72 1.13 0.73 0.84
3 B2 858 784 47.26 3.70 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 1053.8 cm-1
Scaled (by 0.9136) Zero Point Vibrational Energy (zpe) 962.8 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 PBEPBE/STO-3G
ABC
0.79753 0.30420 0.22021

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.644
F2 0.000 1.208 -0.501
F3 0.000 -1.208 -0.501

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.66441.6644
F21.66442.4153
F31.66442.4153

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 93.034
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.378      
2 F -0.189      
3 F -0.189      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.263 0.263
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -16.486 0.000 0.000
y 0.000 -19.851 0.000
z 0.000 0.000 -19.935
Traceless
 xyz
x 3.407 0.000 0.000
y 0.000 -1.641 0.000
z 0.000 0.000 -1.766
Polar
3z2-r2-3.532
x2-y23.365
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.308 0.000 0.000
y 0.000 2.181 0.000
z 0.000 0.000 1.540


<r2> (average value of r2) Å2
<r2> 48.298
(<r2>)1/2 6.950

State 2 (3B1)

Jump to S1C1
Energy calculated at PBEPBE/STO-3G
 hartrees
Energy at 0K-482.458972
Energy at 298.15K-482.339041
HF Energy-482.458972
Nuclear repulsion energy94.238379
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 PBEPBE/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 777 710 0.93      
2 A1 247 225 2.78      
3 B2 834 762 17.50      

Unscaled Zero Point Vibrational Energy (zpe) 928.8 cm-1
Scaled (by 0.9136) Zero Point Vibrational Energy (zpe) 848.5 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 PBEPBE/STO-3G
ABC
1.04804 0.23603 0.19264

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

Point Group is C2v

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.279      
2 F -0.140      
3 F -0.140      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.535 0.535
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.141 0.000 0.000
y 0.000 -19.574 0.000
z 0.000 0.000 -17.497
Traceless
 xyz
x 0.395 0.000 0.000
y 0.000 -1.755 0.000
z 0.000 0.000 1.360
Polar
3z2-r22.720
x2-y21.433
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.842 0.000 0.000
y 0.000 2.355 0.000
z 0.000 0.000 1.999


<r2> (average value of r2) Å2
<r2> 53.191
(<r2>)1/2 7.293