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

using model chemistry: QCISD/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 QCISD/6-31G*
 hartrees
Energy at 0K-326.776675
Energy at 298.15K-326.774935
HF Energy-326.605686
Nuclear repulsion energy25.731355
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 QCISD/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 968 922 10.80      

Unscaled Zero Point Vibrational Energy (zpe) 484.2 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 461.1 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 QCISD/6-31G*
B
0.67265

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.518
C2 0.000 0.000 -1.209

Atom - Atom Distances (Å)
  Si1 C2
Si11.7275
C21.7275

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

Electronic state

Charges, Dipole, Quadrupole and Polarizability

State 2 (1Σ)

Jump to S1C1
Energy calculated at QCISD/6-31G*
 hartrees
Energy at 0K-326.750241
Energy at 298.15K-326.748521
HF Energy-326.494024
Nuclear repulsion energy26.858215
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 QCISD/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 1085 1034 4.11      

Unscaled Zero Point Vibrational Energy (zpe) 542.7 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 516.8 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 QCISD/6-31G*
B
0.73286

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/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 -1.159

Atom - Atom Distances (Å)
  Si1 C2
Si11.6550
C21.6550

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

Electronic state

Charges, Dipole, Quadrupole and Polarizability