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

using model chemistry: B1B95/6-31G(2df,p)

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 B1B95/6-31G(2df,p)
 hartrees
Energy at 0K-439.929652
Energy at 298.15K-439.929930
Nuclear repulsion energy90.022122
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 B1B95/6-31G(2df,p)
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 1017 974 0.00      
2 Σu 1487 1424 62.46      
3 Πu 310 297 72.10      
3 Πu 310 297 72.10      

Unscaled Zero Point Vibrational Energy (zpe) 1561.7 cm-1
Scaled (by 0.9577) Zero Point Vibrational Energy (zpe) 1495.6 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 B1B95/6-31G(2df,p)
B
0.23270

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/6-31G(2df,p)

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 1.505
O3 0.000 0.000 -1.505

Atom - Atom Distances (Å)
  Si1 O2 O3
Si11.50481.5048
O21.50483.0097
O31.50483.0097

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 B1B95/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.791      
2 O -0.395      
3 O -0.395      


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 -19.660 0.000 0.000
y 0.000 -19.660 0.000
z 0.000 0.000 -30.495
Traceless
 xyz
x 5.417 0.000 0.000
y 0.000 5.417 0.000
z 0.000 0.000 -10.835
Polar
3z2-r2-21.669
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 3.051 0.000 0.000
y 0.000 3.051 0.000
z 0.000 0.000 4.836


<r2> (average value of r2) Å2
<r2> 50.768
(<r2>)1/2 7.125