return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for CH (Methylidyne)

using model chemistry: CCD/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C*V 2Π1/2
3 1 yes C*V 4Σ-

State 1 (2Π1/2)

Jump to S2C1 S3C1
Energy calculated at CCD/6-311G**
 hartrees
Energy at 0K-38.386440
Energy at 298.15K 
HF Energy-38.277005
Nuclear repulsion energy2.819505
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 CCD/6-311G**
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 2868 2739 168.53      

Unscaled Zero Point Vibrational Energy (zpe) 1433.8 cm-1
Scaled (by 0.9551) Zero Point Vibrational Energy (zpe) 1369.4 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 CCD/6-311G**
B
14.29801

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/6-311G**

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.161
H2 0.000 0.000 -0.965

Atom - Atom Distances (Å)
  C1 H2
C11.1261
H21.1261

picture of Methylidyne state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

State 2 (2Π3/2)

Jump to S1C1 S3C1
Energy calculated at CCD/6-311G**
 hartrees
Energy at 0K-38.386440
Energy at 298.15K 
HF Energy-38.277005
Nuclear repulsion energy2.819505
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 CCD/6-311G**
Rotational Constants (cm-1) from geometry optimized at CCD/6-311G**
B
14.29801

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/6-311G**

Point Group is C∞v

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

State 3 (4Σ-)

Jump to S1C1 S2C1
Energy calculated at CCD/6-311G**
 hartrees
Energy at 0K-38.366085
Energy at 298.15K-38.364733
HF Energy-38.286346
Nuclear repulsion energy2.911261
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 CCD/6-311G**
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 3160 3018 42.18      

Unscaled Zero Point Vibrational Energy (zpe) 1579.7 cm-1
Scaled (by 0.9551) Zero Point Vibrational Energy (zpe) 1508.8 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 CCD/6-311G**
B
15.24377

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/6-311G**

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.156
H2 0.000 0.000 -0.935

Atom - Atom Distances (Å)
  C1 H2
C11.0906
H21.0906

picture of Methylidyne state 3 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability