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: BLYP/3-21G

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 BLYP/3-21G
 hartrees
Energy at 0K-486.606570
Energy at 298.15K 
HF Energy-486.606570
Nuclear repulsion energy96.782937
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 BLYP/3-21G
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 821 817 41.30 6.99 0.39 0.56
2 A1 314 312 12.50 1.19 0.62 0.76
3 B2 850 845 49.67 6.50 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 992.4 cm-1
Scaled (by 0.9945) Zero Point Vibrational Energy (zpe) 987.0 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 BLYP/3-21G
ABC
0.86661 0.27951 0.21135

See section I.F.4 to change rotational constant units
Geometric Data calculated at BLYP/3-21G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.618
F2 0.000 1.260 -0.481
F3 0.000 -1.260 -0.481

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.67171.6717
F21.67172.5197
F31.67172.5197

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 97.816
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.668      
2 F -0.334      
3 F -0.334      


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 0.934 0.934
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.547 0.000 0.000
y 0.000 -24.997 0.000
z 0.000 0.000 -23.646
Traceless
 xyz
x 4.775 0.000 0.000
y 0.000 -3.401 0.000
z 0.000 0.000 -1.374
Polar
3z2-r2-2.748
x2-y25.450
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.044 0.000 0.000
y 0.000 3.842 0.000
z 0.000 0.000 2.933


<r2> (average value of r2) Å2
<r2> 52.274
(<r2>)1/2 7.230

State 2 (3B1)

Jump to S1C1
Energy calculated at BLYP/3-21G
 hartrees
Energy at 0K-486.485948
Energy at 298.15K-486.366094
HF Energy-486.485948
Nuclear repulsion energy94.052041
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 BLYP/3-21G
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 725 721 5.13      
2 A1 247 246 10.04      
3 B2 845 841 27.08      

Unscaled Zero Point Vibrational Energy (zpe) 908.7 cm-1
Scaled (by 0.9945) Zero Point Vibrational Energy (zpe) 903.7 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 BLYP/3-21G
ABC
1.20452 0.22286 0.18806

See section I.F.4 to change rotational constant units
Geometric Data calculated at BLYP/3-21G

Point Group is C2v

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.582      
2 F -0.291      
3 F -0.291      


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 1.307 1.307
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.667 0.000 0.000
y 0.000 -24.977 0.000
z 0.000 0.000 -20.669
Traceless
 xyz
x 0.157 0.000 0.000
y 0.000 -3.309 0.000
z 0.000 0.000 3.153
Polar
3z2-r26.305
x2-y22.310
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.293 0.000 0.000
y 0.000 3.454 0.000
z 0.000 0.000 3.004


<r2> (average value of r2) Å2
<r2> 56.896
(<r2>)1/2 7.543