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: mPW1PW91/3-21G*

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 mPW1PW91/3-21G*
 hartrees
Energy at 0K-325.698023
Energy at 298.15K-325.696287
HF Energy-325.698023
Nuclear repulsion energy25.838636
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 mPW1PW91/3-21G*
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 987 937 10.33      

Unscaled Zero Point Vibrational Energy (zpe) 493.6 cm-1
Scaled (by 0.9496) Zero Point Vibrational Energy (zpe) 468.7 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 mPW1PW91/3-21G*
B
0.67827

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G*

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
Si11.7203
C21.7203

picture of silicon monocarbide state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.293      
2 C -0.293      


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 1.066 1.066
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.028 0.000 0.000
y 0.000 -20.372 0.000
z 0.000 0.000 -20.005
Traceless
 xyz
x 3.160 0.000 0.000
y 0.000 -1.855 0.000
z 0.000 0.000 -1.305
Polar
3z2-r2-2.611
x2-y23.343
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.331 0.000 0.000
y 0.000 4.730 0.000
z 0.000 0.000 7.167


<r2> (average value of r2) Å2
<r2> 24.382
(<r2>)1/2 4.938

State 2 (1Σ)

Jump to S1C1
Energy calculated at mPW1PW91/3-21G*
 hartrees
Energy at 0K-325.650676
Energy at 298.15K-325.648961
HF Energy-325.650676
Nuclear repulsion energy27.057926
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 mPW1PW91/3-21G*
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 1121 1065 5.69      

Unscaled Zero Point Vibrational Energy (zpe) 560.5 cm-1
Scaled (by 0.9496) Zero Point Vibrational Energy (zpe) 532.3 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 mPW1PW91/3-21G*
B
0.74379

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G*

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.493
C2 0.000 0.000 -1.150

Atom - Atom Distances (Å)
  Si1 C2
Si11.6428
C21.6428

picture of silicon monocarbide state 2 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.266      
2 C -0.266      


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 1.770 1.770
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.762 0.000 0.000
y 0.000 -19.762 0.000
z 0.000 0.000 -15.617
Traceless
 xyz
x -2.072 0.000 0.000
y 0.000 -2.072 0.000
z 0.000 0.000 4.144
Polar
3z2-r28.289
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 10.081 0.000 0.000
y 0.000 10.081 0.000
z 0.000 0.000 7.284


<r2> (average value of r2) Å2
<r2> 22.815
(<r2>)1/2 4.776