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: mPW1PW91/TZVP

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 mPW1PW91/TZVP
 hartrees
Energy at 0K-327.376655
Energy at 298.15K-327.374919
HF Energy-327.376655
Nuclear repulsion energy25.832968
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/TZVP
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 979 934 17.55      

Unscaled Zero Point Vibrational Energy (zpe) 489.5 cm-1
Scaled (by 0.954) Zero Point Vibrational Energy (zpe) 467.0 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/TZVP
B
0.67797

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/TZVP

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.516
C2 0.000 0.000 -1.204

Atom - Atom Distances (Å)
  Si1 C2
Si11.7207
C21.7207

picture of silicon monocarbide state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/TZVP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.213      
2 C -0.213      


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 1.547 1.547
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.086 0.000 0.000
y 0.000 -20.539 0.000
z 0.000 0.000 -19.994
Traceless
 xyz
x 3.181 0.000 0.000
y 0.000 -2.000 0.000
z 0.000 0.000 -1.181
Polar
3z2-r2-2.363
x2-y23.454
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.551 0.000 0.000
y 0.000 6.135 0.000
z 0.000 0.000 8.588


<r2> (average value of r2) Å2
<r2> 24.431
(<r2>)1/2 4.943

State 2 (1Σ)

Jump to S1C1
Energy calculated at mPW1PW91/TZVP
 hartrees
Energy at 0K-327.327607
Energy at 298.15K-327.325891
HF Energy-327.327607
Nuclear repulsion energy27.006700
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/TZVP
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 1097 1046 11.16      

Unscaled Zero Point Vibrational Energy (zpe) 548.3 cm-1
Scaled (by 0.954) Zero Point Vibrational Energy (zpe) 523.0 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/TZVP
B
0.74098

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/TZVP

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.494
C2 0.000 0.000 -1.152

Atom - Atom Distances (Å)
  Si1 C2
Si11.6459
C21.6459

picture of silicon monocarbide state 2 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/TZVP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.218      
2 C -0.218      


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 2.194 2.194
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.952 0.000 0.000
y 0.000 -19.952 0.000
z 0.000 0.000 -15.349
Traceless
 xyz
x -2.302 0.000 0.000
y 0.000 -2.302 0.000
z 0.000 0.000 4.604
Polar
3z2-r29.207
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 23.459 0.000 0.000
y 0.000 23.459 0.000
z 0.000 0.000 8.359


<r2> (average value of r2) Å2
<r2> 22.881
(<r2>)1/2 4.783