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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: HF/aug-cc-pVQZ

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/aug-cc-pVQZ
 hartrees
Energy at 0K-489.228410
Energy at 298.15K 
HF Energy-489.228410
Nuclear repulsion energy120.338367
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/aug-cc-pVQZ
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 2399 2179 64.41 198.32 0.05 0.10
2 A1 1065 967 150.03 3.22 0.74 0.85
3 A1 930 845 88.69 3.59 0.11 0.20
4 A1 347 315 22.54 0.21 0.72 0.84
5 A2 795 722 0.00 4.88 0.75 0.86
6 B1 2394 2175 170.26 25.15 0.75 0.86
7 B1 767 697 169.00 1.59 0.75 0.86
8 B2 1049 953 349.24 0.02 0.75 0.86
9 B2 970 881 1.74 2.73 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5358.1 cm-1
Scaled (by 0.9085) Zero Point Vibrational Energy (zpe) 4867.8 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/aug-cc-pVQZ
ABC
0.82988 0.26586 0.21704

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/aug-cc-pVQZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.443
F2 0.000 1.261 -0.483
F3 0.000 -1.261 -0.483
H4 1.225 0.000 1.241
H5 -1.225 0.000 1.241

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.56431.56431.46181.4618
F21.56432.52122.46202.4620
F31.56432.52122.46202.4620
H41.46182.46202.46202.4498
H51.46182.46202.46202.4498

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.388 F2 Si1 H4 108.852
F2 Si1 H5 108.852 F3 Si1 H4 108.852
F3 Si1 H5 108.852 H4 Si1 H5 113.851
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/aug-cc-pVQZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 1.619      
2 F -0.643      
3 F -0.643      
4 H -0.166      
5 H -0.166      


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 1.591 1.591
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.813 0.000 0.000
y 0.000 -26.284 0.000
z 0.000 0.000 -23.154
Traceless
 xyz
x 1.906 0.000 0.000
y 0.000 -3.300 0.000
z 0.000 0.000 1.394
Polar
3z2-r22.789
x2-y23.471
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.602 0.000 0.000
y 0.000 3.271 0.000
z 0.000 0.000 3.331


<r2> (average value of r2) Å2
<r2> 56.677
(<r2>)1/2 7.528