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 SiC2 (Silicon dicarbide)

using model chemistry: PBEPBE/daug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBEPBE/daug-cc-pVDZ
 hartrees
Energy at 0K-365.286786
Energy at 298.15K 
HF Energy-365.286786
Nuclear repulsion energy62.143974
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 PBEPBE/daug-cc-pVDZ
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 1758 1758 22.66 35.28 0.04 0.08
2 A1 762 762 140.35 47.36 0.15 0.27
3 B2 150 150 93.82 13.56 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 1334.8 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 1334.8 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 PBEPBE/daug-cc-pVDZ
ABC
1.69218 0.41978 0.33634

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/daug-cc-pVDZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.814
C2 0.000 0.644 -0.949
C3 0.000 -0.644 -0.949

Atom - Atom Distances (Å)
  Si1 C2 C3
Si11.87721.8772
C21.87721.2885
C31.87721.2885

picture of Silicon dicarbide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C2 Si1 C3 40.146
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/daug-cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.239      
2 C -0.119      
3 C -0.119      


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 2.388 2.388
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -23.243 0.000 0.000
y 0.000 -26.558 0.000
z 0.000 0.000 -25.443
Traceless
 xyz
x 2.757 0.000 0.000
y 0.000 -2.215 0.000
z 0.000 0.000 -0.542
Polar
3z2-r2-1.085
x2-y23.315
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.589 0.000 0.000
y 0.000 7.147 0.000
z 0.000 0.000 8.279


<r2> (average value of r2) Å2
<r2> 40.733
(<r2>)1/2 6.382