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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: B3PW91/TZVP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at B3PW91/TZVP
 hartrees
Energy at 0K-490.470824
Energy at 298.15K 
HF Energy-490.470824
Nuclear repulsion energy116.966729
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 B3PW91/TZVP
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 2280 2199 52.56 187.84 0.11 0.19
2 A1 961 927 127.98 13.12 0.69 0.82
3 A1 838 808 79.94 5.20 0.18 0.30
4 A1 301 290 19.23 1.15 0.73 0.85
5 A2 710 685 0.00 18.34 0.75 0.86
6 B1 2298 2216 139.30 41.98 0.75 0.86
7 B1 697 672 134.95 5.88 0.75 0.86
8 B2 952 918 326.61 1.58 0.75 0.86
9 B2 876 845 1.35 10.28 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4956.4 cm-1
Scaled (by 0.9643) Zero Point Vibrational Energy (zpe) 4779.4 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 B3PW91/TZVP
ABC
0.79301 0.24954 0.20428

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/TZVP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.458
F2 0.000 1.302 -0.495
F3 0.000 -1.302 -0.495
H4 1.249 0.000 1.248
H5 -1.249 0.000 1.248

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.61301.61301.47791.4779
F21.61302.60402.50812.5081
F31.61302.60402.50812.5081
H41.47792.50812.50812.4978
H51.47792.50812.50812.4978

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.641 F2 Si1 H4 108.398
F2 Si1 H5 108.398 F3 Si1 H4 108.398
F3 Si1 H5 108.398 H4 Si1 H5 115.358
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/TZVP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.833      
2 F -0.320      
3 F -0.320      
4 H -0.096      
5 H -0.096      


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 1.828 1.828
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.781 0.000 0.000
y 0.000 -26.773 0.000
z 0.000 0.000 -23.051
Traceless
 xyz
x 2.131 0.000 0.000
y 0.000 -3.856 0.000
z 0.000 0.000 1.726
Polar
3z2-r23.451
x2-y23.991
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.506 0.000 0.000
y 0.000 3.037 0.000
z 0.000 0.000 3.203


<r2> (average value of r2) Å2
<r2> 59.197
(<r2>)1/2 7.694