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

using model chemistry: PBEPBE/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 PBEPBE/6-31G*
 hartrees
Energy at 0K-327.157696
Energy at 298.15K-327.155952
HF Energy-327.157696
Nuclear repulsion energy25.572317
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/6-31G*
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 949 935 8.15      

Unscaled Zero Point Vibrational Energy (zpe) 474.4 cm-1
Scaled (by 0.9857) Zero Point Vibrational Energy (zpe) 467.6 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/6-31G*
B
0.66436

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.521
C2 0.000 0.000 -1.217

Atom - Atom Distances (Å)
  Si1 C2
Si11.7382
C21.7382

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/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.179      
2 C -0.179      


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 1.155 1.155
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -16.991 0.000 0.000
y 0.000 -20.274 0.000
z 0.000 0.000 -19.664
Traceless
 xyz
x 2.979 0.000 0.000
y 0.000 -1.947 0.000
z 0.000 0.000 -1.032
Polar
3z2-r2-2.063
x2-y23.284
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.367 0.000 0.000
y 0.000 5.409 0.000
z 0.000 0.000 7.629


<r2> (average value of r2) Å2
<r2> 24.543
(<r2>)1/2 4.954

State 2 (1Σ)

Jump to S1C1
Energy calculated at PBEPBE/6-31G*
 hartrees
Energy at 0K-327.123407
Energy at 298.15K-327.121685
HF Energy-327.123407
Nuclear repulsion energy26.809178
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/6-31G*
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 1074 1058 2.25      

Unscaled Zero Point Vibrational Energy (zpe) 536.8 cm-1
Scaled (by 0.9857) Zero Point Vibrational Energy (zpe) 529.1 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 PBEPBE/6-31G*
B
0.73018

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.497
C2 0.000 0.000 -1.161

Atom - Atom Distances (Å)
  Si1 C2
Si11.6580
C21.6580

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/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.141      
2 C -0.141      


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 1.731 1.731
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.694 0.000 0.000
y 0.000 -19.694 0.000
z 0.000 0.000 -15.333
Traceless
 xyz
x -2.181 0.000 0.000
y 0.000 -2.181 0.000
z 0.000 0.000 4.361
Polar
3z2-r28.722
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 3.367 0.000 0.000
y 0.000 5.409 0.000
z 0.000 0.000 7.629


<r2> (average value of r2) Å2
<r2> 22.939
(<r2>)1/2 4.789