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: PBEPBE/3-21G

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 PBEPBE/3-21G
 hartrees
Energy at 0K-325.432279
Energy at 298.15K-325.430525
HF Energy-325.432279
Nuclear repulsion energy24.872235
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/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σ 899 891 5.60      

Unscaled Zero Point Vibrational Energy (zpe) 449.6 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 445.5 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/3-21G
B
0.62848

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/3-21G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.536
C2 0.000 0.000 -1.251

Atom - Atom Distances (Å)
  Si1 C2
Si11.7872
C21.7872

picture of silicon monocarbide state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.404      
2 C -0.404      


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 1.133 1.133
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.332 0.000 0.000
y 0.000 -20.696 0.000
z 0.000 0.000 -20.488
Traceless
 xyz
x 3.260 0.000 0.000
y 0.000 -1.786 0.000
z 0.000 0.000 -1.474
Polar
3z2-r2-2.948
x2-y23.364
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.247 0.000 0.000
y 0.000 5.032 0.000
z 0.000 0.000 7.489


<r2> (average value of r2) Å2
<r2> 25.597
(<r2>)1/2 5.059

State 2 (1Σ)

Jump to S1C1
Energy calculated at PBEPBE/3-21G
 hartrees
Energy at 0K-325.398687
Energy at 298.15K-325.396960
HF Energy-325.398687
Nuclear repulsion energy26.216284
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/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σ 1030 1021 0.48      

Unscaled Zero Point Vibrational Energy (zpe) 515.1 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 510.4 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 PBEPBE/3-21G
B
0.69824

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/3-21G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.509
C2 0.000 0.000 -1.187

Atom - Atom Distances (Å)
  Si1 C2
Si11.6955
C21.6955

picture of silicon monocarbide state 2 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.406      
2 C -0.406      


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 1.740 1.740
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.062 0.000 0.000
y 0.000 -20.062 0.000
z 0.000 0.000 -16.014
Traceless
 xyz
x -2.024 0.000 0.000
y 0.000 -2.024 0.000
z 0.000 0.000 4.048
Polar
3z2-r28.096
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 3.247 0.000 0.000
y 0.000 5.032 0.000
z 0.000 0.000 7.489


<r2> (average value of r2) Å2
<r2> 23.762
(<r2>)1/2 4.875