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All results from a given calculation for SiC (silicon monocarbide)

using model chemistry: HF/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 HF/3-21G
 hartrees
Energy at 0K-324.902735
Energy at 298.15K-324.900944
HF Energy-324.902735
Nuclear repulsion energy24.212837
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/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 776 702 67.15      

Unscaled Zero Point Vibrational Energy (zpe) 387.7 cm-1
Scaled (by 0.9056) Zero Point Vibrational Energy (zpe) 351.1 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/3-21G
B
0.59560

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.551
C2 0.000 0.000 -1.285

Atom - Atom Distances (Å)
  Si1 C2
Si11.8358
C21.8358

picture of silicon monocarbide state 1 conformation 1
More geometry information
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.517      
2 C -0.517      


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 0.549 0.549
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -21.361 0.000 0.000
y 0.000 -17.070 0.000
z 0.000 0.000 -21.897
Traceless
 xyz
x -1.878 0.000 0.000
y 0.000 4.560 0.000
z 0.000 0.000 -2.682
Polar
3z2-r2-5.363
x2-y2-4.292
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.609 0.000 0.000
y 0.000 3.440 0.000
z 0.000 0.000 5.983


<r2> (average value of r2) Å2
<r2> 26.715
(<r2>)1/2 5.169

State 2 (1Σ)

Jump to S1C1
Energy calculated at HF/3-21G
 hartrees
Energy at 0K-324.783008
Energy at 298.15K-324.781285
HF Energy-324.783008
Nuclear repulsion energy26.498378
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/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 1057 957 32.97      

Unscaled Zero Point Vibrational Energy (zpe) 528.3 cm-1
Scaled (by 0.9056) Zero Point Vibrational Energy (zpe) 478.4 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 HF/3-21G
B
0.71335

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.503
C2 0.000 0.000 -1.174

Atom - Atom Distances (Å)
  Si1 C2
Si11.6775
C21.6775

picture of silicon monocarbide state 2 conformation 1
More geometry information
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.551      
2 C -0.551      


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 1.503 1.503
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.351 0.000 0.000
y 0.000 -20.351 0.000
z 0.000 0.000 -16.771
Traceless
 xyz
x -1.790 0.000 0.000
y 0.000 -1.790 0.000
z 0.000 0.000 3.581
Polar
3z2-r27.161
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 -6.066 0.000 0.000
y 0.000 -6.066 0.000
z 0.000 0.000 7.609


<r2> (average value of r2) Å2
<r2> 23.784
(<r2>)1/2 4.877