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: B3PW91/6-311G**

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 B3PW91/6-311G**
 hartrees
Energy at 0K-489.211492
Energy at 298.15K 
HF Energy-489.211492
Nuclear repulsion energy99.478556
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 B3PW91/6-311G**
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 842 811 132.74 4.29 0.61 0.76
2 A1 334 321 19.17 0.85 0.44 0.61
3 B2 856 825 160.80 5.65 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 1015.5 cm-1
Scaled (by 0.9631) Zero Point Vibrational Energy (zpe) 978.0 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 B3PW91/6-311G**
ABC
0.96672 0.28685 0.22121

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-311G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.585
F2 0.000 1.244 -0.455
F3 0.000 -1.244 -0.455

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.62141.6214
F21.62142.4873
F31.62142.4873

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 100.176
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.811      
2 F -0.406      
3 F -0.406      


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 1.389 1.389
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.296 0.000 0.000
y 0.000 -25.225 0.000
z 0.000 0.000 -23.143
Traceless
 xyz
x 4.888 0.000 0.000
y 0.000 -4.005 0.000
z 0.000 0.000 -0.882
Polar
3z2-r2-1.765
x2-y25.929
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.372 0.000 0.000
y 0.000 3.784 0.000
z 0.000 0.000 3.043


<r2> (average value of r2) Å2
<r2> 50.450
(<r2>)1/2 7.103

State 2 (3B1)

Jump to S1C1
Energy calculated at B3PW91/6-311G**
 hartrees
Energy at 0K-489.099037
Energy at 298.15K-488.979240
HF Energy-489.099037
Nuclear repulsion energy97.885067
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 B3PW91/6-311G**
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 794 764 57.37      
2 A1 255 245 18.50      
3 B2 920 886 141.05      

Unscaled Zero Point Vibrational Energy (zpe) 984.0 cm-1
Scaled (by 0.9631) Zero Point Vibrational Energy (zpe) 947.7 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 B3PW91/6-311G**
ABC
1.39058 0.23639 0.20204

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-311G**

Point Group is C2v

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.760      
2 F -0.380      
3 F -0.380      


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 1.879 1.879
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.561 0.000 0.000
y 0.000 -25.561 0.000
z 0.000 0.000 -20.214
Traceless
 xyz
x 0.327 0.000 0.000
y 0.000 -4.173 0.000
z 0.000 0.000 3.847
Polar
3z2-r27.693
x2-y23.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.518 0.000 0.000
y 0.000 3.214 0.000
z 0.000 0.000 2.474


<r2> (average value of r2) Å2
<r2> 53.935
(<r2>)1/2 7.344