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 SiH2F2 (difluorosilane)

using model chemistry: HF/SDD

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at HF/SDD
 hartrees
Energy at 0K-489.026125
Energy at 298.15K 
HF Energy-489.026125
Nuclear repulsion energy114.237383
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/SDD
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 2425 2184 62.74 173.37 0.10 0.18
2 A1 1044 940 201.50 24.43 0.71 0.83
3 A1 825 743 88.51 4.96 0.12 0.22
4 A1 296 267 35.45 1.16 0.75 0.86
5 A2 759 683 0.00 23.74 0.75 0.86
6 B1 2439 2196 142.40 34.65 0.75 0.86
7 B1 736 663 197.09 7.77 0.75 0.86
8 B2 1007 907 376.97 10.59 0.75 0.86
9 B2 882 794 44.03 6.96 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5206.8 cm-1
Scaled (by 0.9004) Zero Point Vibrational Energy (zpe) 4688.2 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 HF/SDD
ABC
0.73987 0.24063 0.19464

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.485
F2 0.000 1.327 -0.516
F3 0.000 -1.327 -0.516
H4 1.243 0.000 1.249
H5 -1.243 0.000 1.249

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.66261.66261.45931.4593
F21.66262.65462.53462.5346
F31.66262.65462.53462.5346
H41.45932.53462.53462.4864
H51.45932.53462.53462.4864

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 105.942 F2 Si1 H4 108.382
F2 Si1 H5 108.382 F3 Si1 H4 108.382
F3 Si1 H5 108.382 H4 Si1 H5 116.844
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/SDD Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 1.625      
2 F -0.628      
3 F -0.628      
4 H -0.184      
5 H -0.184      


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 3.387 3.387
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -23.220 0.000 0.000
y 0.000 -30.334 0.000
z 0.000 0.000 -23.804
Traceless
 xyz
x 3.850 0.000 0.000
y 0.000 -6.822 0.000
z 0.000 0.000 2.973
Polar
3z2-r25.946
x2-y27.115
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.749 0.000 0.000
y 0.000 2.283 0.000
z 0.000 0.000 2.428


<r2> (average value of r2) Å2
<r2> 62.119
(<r2>)1/2 7.882