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: LSDA/6-31G(2df,p)

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 LSDA/6-31G(2df,p)
 hartrees
Energy at 0K-487.496105
Energy at 298.15K-487.376418
HF Energy-487.496105
Nuclear repulsion energy101.194255
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 LSDA/6-31G(2df,p)
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 874 860 88.27      
2 A1 329 323 13.37      
3 B2 908 894 109.33      

Unscaled Zero Point Vibrational Energy (zpe) 1055.3 cm-1
Scaled (by 0.984) Zero Point Vibrational Energy (zpe) 1038.4 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 LSDA/6-31G(2df,p)
ABC
1.01122 0.29519 0.22849

See section I.F.4 to change rotational constant units
Geometric Data calculated at LSDA/6-31G(2df,p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.572
F2 0.000 1.226 -0.445
F3 0.000 -1.226 -0.445

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.59301.5930
F21.59302.4519
F31.59302.4519

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 100.636
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at LSDA/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.159      
2 F -0.079      
3 F -0.079      


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 0.677 0.677
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.974 0.000 0.000
y 0.000 -23.606 0.000
z 0.000 0.000 -22.862
Traceless
 xyz
x 3.260 0.000 0.000
y 0.000 -2.188 0.000
z 0.000 0.000 -1.072
Polar
3z2-r2-2.143
x2-y23.632
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.954 0.000 0.000
y 0.000 4.091 0.000
z 0.000 0.000 3.588


<r2> (average value of r2) Å2
<r2> 49.034
(<r2>)1/2 7.002

State 2 (3B1)

Jump to S1C1
Energy calculated at LSDA/6-31G(2df,p)
 hartrees
Energy at 0K-487.373414
Energy at 298.15K-487.253635
HF Energy-487.373414
Nuclear repulsion energy99.732560
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 LSDA/6-31G(2df,p)
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 830 817 40.52      
2 A1 253 249 9.86      
3 B2 963 948 98.59      

Unscaled Zero Point Vibrational Energy (zpe) 1023.5 cm-1
Scaled (by 0.984) Zero Point Vibrational Energy (zpe) 1007.1 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 LSDA/6-31G(2df,p)
ABC
1.39459 0.24815 0.21066

See section I.F.4 to change rotational constant units
Geometric Data calculated at LSDA/6-31G(2df,p)

Point Group is C2v

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at LSDA/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.151      
2 F -0.075      
3 F -0.075      


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 1.014 1.014
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.958 0.000 0.000
y 0.000 -23.466 0.000
z 0.000 0.000 -20.607
Traceless
 xyz
x -0.922 0.000 0.000
y 0.000 -1.684 0.000
z 0.000 0.000 2.605
Polar
3z2-r25.210
x2-y20.508
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.757 0.000 0.000
y 0.000 3.715 0.000
z 0.000 0.000 3.275


<r2> (average value of r2) Å2
<r2> 52.045
(<r2>)1/2 7.214