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 SiC (silicon monocarbide)

using model chemistry: HF/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C*V 3Σ
2 1 yes C*V 1Σ

State 1 (3Σ)

Jump to S2C1
Energy calculated at HF/6-31G*
 hartrees
Energy at 0K-326.606381
Energy at 298.15K-326.604606
HF Energy-326.606381
Nuclear repulsion energy25.143990
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 HF/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Σ 830 746 38.09      

Unscaled Zero Point Vibrational Energy (zpe) 414.9 cm-1
Scaled (by 0.8985) Zero Point Vibrational Energy (zpe) 372.7 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 HF/6-31G*
B
0.64229

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.530
C2 0.000 0.000 -1.237

Atom - Atom Distances (Å)
  Si1 C2
Si11.7679
C21.7679

picture of silicon monocarbide state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

State 2 (1Σ)

Jump to S1C1
Energy calculated at HF/6-31G*
 hartrees
Energy at 0K-326.494724
Energy at 298.15K-326.493013
HF Energy-326.494725
Nuclear repulsion energy27.374758
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 HF/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Σ 1156 1038 57.06      

Unscaled Zero Point Vibrational Energy (zpe) 577.7 cm-1
Scaled (by 0.8985) Zero Point Vibrational Energy (zpe) 519.1 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 HF/6-31G*
B
0.76131

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.487
C2 0.000 0.000 -1.137

Atom - Atom Distances (Å)
  Si1 C2
Si11.6238
C21.6238

picture of silicon monocarbide state 2 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.321      
2 C -0.321      


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 1.433 1.433
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.789 0.000 0.000
y 0.000 -19.789 0.000
z 0.000 0.000 -15.861
Traceless
 xyz
x -1.964 0.000 0.000
y 0.000 -1.964 0.000
z 0.000 0.000 3.928
Polar
3z2-r27.856
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 -2.747 0.000 0.000
y 0.000 -2.747 0.000
z 0.000 0.000 7.584


<r2> (average value of r2) Å2
<r2> 22.616
(<r2>)1/2 4.756