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All results from a given calculation for SiF2 (Silicon difluoride)

using model chemistry: PBEPBE/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 PBEPBE/3-21G*
 hartrees
Energy at 0K-486.395955
Energy at 298.15K 
HF Energy-486.395955
Nuclear repulsion energy99.600635
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/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 895 853 62.55 4.83 0.47 0.64
2 A1 331 316 13.48 0.72 0.51 0.68
3 B2 945 901 72.76 5.70 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 1085.2 cm-1
Scaled (by 0.9535) Zero Point Vibrational Energy (zpe) 1034.7 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 PBEPBE/3-21G*
ABC
0.98726 0.28484 0.22106

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.579
F2 0.000 1.248 -0.450
F3 0.000 -1.248 -0.450

Atom - Atom Distances (Å)
  Si1 F2 F3
Si11.61781.6178
F21.61782.4961
F31.61782.4961

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 100.966
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.508      
2 F -0.254      
3 F -0.254      


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 0.498 0.498
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.564 0.000 0.000
y 0.000 -23.879 0.000
z 0.000 0.000 -23.091
Traceless
 xyz
x 3.921 0.000 0.000
y 0.000 -2.552 0.000
z 0.000 0.000 -1.369
Polar
3z2-r2-2.738
x2-y24.315
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.238 0.000 0.000
y 0.000 3.626 0.000
z 0.000 0.000 2.827


<r2> (average value of r2) Å2
<r2> 50.234
(<r2>)1/2 7.088

State 2 (3B1)

Jump to S1C1
Energy calculated at PBEPBE/3-21G*
 hartrees
Energy at 0K-486.277537
Energy at 298.15K-486.157752
HF Energy-486.277537
Nuclear repulsion energy97.506991
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/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 819 781 18.19      
2 A1 253 241 11.15      
3 B2 967 922 58.08      

Unscaled Zero Point Vibrational Energy (zpe) 1019.6 cm-1
Scaled (by 0.9535) Zero Point Vibrational Energy (zpe) 972.2 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/3-21G*
ABC
1.38836 0.23411 0.20033

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

Point Group is C2v

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.472      
2 F -0.236      
3 F -0.236      


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 1.132 1.132
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.553 0.000 0.000
y 0.000 -23.943 0.000
z 0.000 0.000 -20.287
Traceless
 xyz
x -0.438 0.000 0.000
y 0.000 -2.523 0.000
z 0.000 0.000 2.961
Polar
3z2-r25.921
x2-y21.390
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.401 0.000 0.000
y 0.000 3.140 0.000
z 0.000 0.000 2.554


<r2> (average value of r2) Å2
<r2> 53.950
(<r2>)1/2 7.345