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: HSEh1PBE/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 HSEh1PBE/TZVP
 hartrees
Energy at 0K-490.294634
Energy at 298.15K 
HF Energy-490.294634
Nuclear repulsion energy117.139016
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 HSEh1PBE/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 2285 2193 51.26 189.01 0.11 0.19
2 A1 961 922 129.44 12.99 0.69 0.81
3 A1 844 811 79.52 5.09 0.18 0.31
4 A1 302 290 19.64 1.11 0.73 0.85
5 A2 708 680 0.00 18.29 0.75 0.86
6 B1 2302 2210 136.87 41.42 0.75 0.86
7 B1 697 669 136.75 5.83 0.75 0.86
8 B2 954 916 327.75 1.22 0.75 0.86
9 B2 879 844 0.07 10.62 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4965.5 cm-1
Scaled (by 0.9601) Zero Point Vibrational Energy (zpe) 4767.4 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 HSEh1PBE/TZVP
ABC
0.79351 0.25059 0.20503

See section I.F.4 to change rotational constant units
Geometric Data calculated at HSEh1PBE/TZVP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.457
F2 0.000 1.299 -0.494
F3 0.000 -1.299 -0.494
H4 1.250 0.000 1.247
H5 -1.250 0.000 1.247

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.61041.61041.47821.4782
F21.61042.59822.50642.5064
F31.61042.59822.50642.5064
H41.47822.50642.50642.4991
H51.47822.50642.50642.4991

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.544 F2 Si1 H4 108.406
F2 Si1 H5 108.406 F3 Si1 H4 108.406
F3 Si1 H5 108.406 H4 Si1 H5 115.411
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HSEh1PBE/TZVP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.827      
2 F -0.322      
3 F -0.322      
4 H -0.092      
5 H -0.092      


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 1.848 1.848
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.818 0.000 0.000
y 0.000 -26.829 0.000
z 0.000 0.000 -23.088
Traceless
 xyz
x 2.141 0.000 0.000
y 0.000 -3.876 0.000
z 0.000 0.000 1.735
Polar
3z2-r23.470
x2-y24.011
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.509 0.000 0.000
y 0.000 3.020 0.000
z 0.000 0.000 3.195


<r2> (average value of r2) Å2
<r2> 59.082
(<r2>)1/2 7.686