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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: PBEPBEultrafine/aug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBEPBEultrafine/aug-cc-pVDZ
 hartrees
Energy at 0K-490.166527
Energy at 298.15K 
HF Energy-490.166527
Nuclear repulsion energy114.403079
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 PBEPBEultrafine/aug-cc-pVDZ
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 2201 2188 43.07 238.08 0.07 0.14
2 A1 913 908 94.99 6.35 0.70 0.82
3 A1 786 781 67.00 10.01 0.09 0.17
4 A1 275 273 14.55 0.79 0.72 0.84
5 A2 676 672 0.00 8.12 0.75 0.86
6 B1 2227 2214 106.64 40.10 0.75 0.86
7 B1 658 654 94.57 3.25 0.75 0.86
8 B2 892 886 245.67 0.04 0.75 0.86
9 B2 825 820 5.98 5.16 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4726.4 cm-1
Scaled (by 0.9939) Zero Point Vibrational Energy (zpe) 4697.6 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 PBEPBEultrafine/aug-cc-pVDZ
ABC
0.75831 0.23869 0.19522

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.471
F2 0.000 1.332 -0.507
F3 0.000 -1.332 -0.507
H4 1.270 0.000 1.260
H5 -1.270 0.000 1.260

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.65201.65201.49501.4950
F21.65202.66322.55072.5507
F31.65202.66322.55072.5507
H41.49502.55072.55072.5407
H51.49502.55072.55072.5407

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.419 F2 Si1 H4 108.184
F2 Si1 H5 108.184 F3 Si1 H4 108.184
F3 Si1 H5 108.184 H4 Si1 H5 116.358
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/aug-cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.468      
2 F -0.508      
3 F -0.508      
4 H 0.274      
5 H 0.274      


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 1.867 1.867
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -23.204 0.000 0.000
y 0.000 -27.124 0.000
z 0.000 0.000 -23.380
Traceless
 xyz
x 2.048 0.000 0.000
y 0.000 -3.832 0.000
z 0.000 0.000 1.785
Polar
3z2-r23.569
x2-y23.920
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.385 0.000 0.000
y 0.000 4.232 0.000
z 0.000 0.000 4.205


<r2> (average value of r2) Å2
<r2> 61.390
(<r2>)1/2 7.835