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All results from a given calculation for Si2H6 (disilane)

using model chemistry: PBEPBEultrafine/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D3D 1A1g
Energy calculated at PBEPBEultrafine/6-31G**
 hartrees
Energy at 0K-582.220646
Energy at 298.15K-582.226336
HF Energy-582.220646
Nuclear repulsion energy90.174400
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/6-31G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1g 2168 2138 0.00      
2 A1g 876 864 0.00      
3 A1g 427 421 0.00      
4 A1u 132 130 0.00      
5 A2u 2161 2131 115.75      
6 A2u 806 795 423.30      
7 Eg 2175 2145 0.00      
7 Eg 2175 2145 0.00      
8 Eg 904 891 0.00      
8 Eg 904 891 0.00      
9 Eg 609 601 0.00      
9 Eg 609 601 0.00      
10 Eu 2186 2156 208.93      
10 Eu 2186 2156 208.98      
11 Eu 917 905 65.29      
11 Eu 917 905 65.30      
12 Eu 359 354 15.07      
12 Eu 359 354 15.07      

Unscaled Zero Point Vibrational Energy (zpe) 10434.8 cm-1
Scaled (by 0.9863) Zero Point Vibrational Energy (zpe) 10291.9 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/6-31G**
ABC
1.41262 0.16736 0.16736

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBEultrafine/6-31G**

Point Group is D3d

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 1.175
Si2 0.000 0.000 -1.175
H3 0.000 1.405 1.702
H4 -1.217 -0.702 1.702
H5 1.217 -0.702 1.702
H6 0.000 -1.405 -1.702
H7 -1.217 0.702 -1.702
H8 1.217 0.702 -1.702

Atom - Atom Distances (Å)
  Si1 Si2 H3 H4 H5 H6 H7 H8
Si12.34991.50041.50041.50043.20153.20153.2015
Si22.34993.20153.20153.20151.50041.50041.5004
H31.50043.20152.43322.43324.41363.68233.6823
H41.50043.20152.43322.43323.68233.68234.4136
H51.50043.20152.43322.43323.68234.41363.6823
H63.20151.50044.41363.68233.68232.43322.4332
H73.20151.50043.68233.68234.41362.43322.4332
H83.20151.50043.68234.41363.68232.43322.4332

picture of disilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Si1 Si2 H6 110.561 Si1 Si2 H7 110.561
Si1 Si2 H8 110.561 Si2 Si1 H3 110.561
Si2 Si1 H4 110.561 Si2 Si1 H5 110.561
H3 Si1 H4 108.360 H3 Si1 H5 108.360
H4 Si1 H5 108.360 H6 Si2 H7 108.360
H6 Si2 H8 108.360 H7 Si2 H8 108.360
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.123      
2 Si 0.123      
3 H -0.041      
4 H -0.041      
5 H -0.041      
6 H -0.041      
7 H -0.041      
8 H -0.041      


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 0.000 0.000
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -30.792 0.000 0.000
y 0.000 -30.792 0.000
z 0.000 0.000 -31.754
Traceless
 xyz
x 0.481 0.000 0.000
y 0.000 0.481 0.000
z 0.000 0.000 -0.962
Polar
3z2-r2-1.924
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.705 0.000 0.000
y 0.000 6.705 -0.000
z 0.000 -0.000 9.774


<r2> (average value of r2) Å2
<r2> 87.308
(<r2>)1/2 9.344