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All results from a given calculation for SiO2 (silicon dioxide)

using model chemistry: mPW1PW91/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 1Σg
Energy calculated at mPW1PW91/6-31G
 hartrees
Energy at 0K-439.758152
Energy at 298.15K-439.758054
Nuclear repulsion energy85.427073
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 mPW1PW91/6-31G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σg 864 818 0.00      
2 Σu 1285 1216 41.46      
3 Πu 188 178 59.85      
3 Πu 188 178 59.85      

Unscaled Zero Point Vibrational Energy (zpe) 1261.8 cm-1
Scaled (by 0.9466) Zero Point Vibrational Energy (zpe) 1194.4 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 mPW1PW91/6-31G
B
0.20955

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-31G

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.000
O2 0.000 0.000 1.586
O3 0.000 0.000 -1.586

Atom - Atom Distances (Å)
  Si1 O2 O3
Si11.58581.5858
O21.58583.1716
O31.58583.1716

picture of silicon dioxide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O2 Si1 O3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 1.139      
2 O -0.569      
3 O -0.569      


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 -20.295 0.000 0.000
y 0.000 -20.295 0.000
z 0.000 0.000 -34.510
Traceless
 xyz
x 7.108 0.000 0.000
y 0.000 7.108 0.000
z 0.000 0.000 -14.215
Polar
3z2-r2-28.430
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 2.360 0.000 0.000
y 0.000 2.360 0.000
z 0.000 0.000 5.988


<r2> (average value of r2) Å2
<r2> 55.871
(<r2>)1/2 7.475