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: HF/LANL2DZ

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 HF/LANL2DZ
 hartrees
Energy at 0K-202.703521
Energy at 298.15K 
HF Energy-202.703521
Nuclear repulsion energy40.183186
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 HF/LANL2DZ
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 828 745 146.33 6.59 0.33 0.50
2 A1 354 319 32.68 0.88 0.52 0.69
3 B2 817 735 167.96 6.23 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 999.3 cm-1
Scaled (by 0.8999) Zero Point Vibrational Energy (zpe) 899.3 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 HF/LANL2DZ
ABC
0.85331 0.28817 0.21542

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/LANL2DZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.623
F2 0.000 1.241 -0.484
F3 0.000 -1.241 -0.484

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.66301.6630
F21.66302.4816
F31.66302.4816

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 96.509
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/LANL2DZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 1.267      
2 F -0.633      
3 F -0.633      


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 2.785 2.785
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.621 0.000 0.000
y 0.000 -27.208 0.000
z 0.000 0.000 -23.501
Traceless
 xyz
x 7.734 0.000 0.000
y 0.000 -6.647 0.000
z 0.000 0.000 -1.087
Polar
3z2-r2-2.174
x2-y29.587
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.181 0.000 0.000
y 0.000 3.511 0.000
z 0.000 0.000 2.448


<r2> (average value of r2) Å2
<r2> 47.714
(<r2>)1/2 6.908

State 2 (3B1)

Jump to S1C1
Energy calculated at HF/LANL2DZ
 hartrees
Energy at 0K-202.620577
Energy at 298.15K-202.500765
HF Energy-202.620577
Nuclear repulsion energy38.217987
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 HF/LANL2DZ
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 785 706 69.70      
2 A1 255 229 42.99      
3 B2 897 807 134.48      

Unscaled Zero Point Vibrational Energy (zpe) 968.2 cm-1
Scaled (by 0.8999) Zero Point Vibrational Energy (zpe) 871.3 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 HF/LANL2DZ
ABC
1.26494 0.22762 0.19291

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/LANL2DZ

Point Group is C2v

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/LANL2DZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 1.194      
2 F -0.597      
3 F -0.597      


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 3.376 3.376
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.982 0.000 0.000
y 0.000 -28.420 0.000
z 0.000 0.000 -19.295
Traceless
 xyz
x 2.876 0.000 0.000
y 0.000 -8.282 0.000
z 0.000 0.000 5.406
Polar
3z2-r210.813
x2-y27.438
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.266 0.000 0.000
y 0.000 2.850 0.000
z 0.000 0.000 1.778


<r2> (average value of r2) Å2
<r2> 53.283
(<r2>)1/2 7.300