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All results from a given calculation for CH3I (methyl iodide)

using model chemistry: MP2/CEP-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at MP2/CEP-31G
 hartrees
Energy at 0K-18.529050
Energy at 298.15K 
HF Energy-18.421231
Nuclear repulsion energy17.410821
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 MP2/CEP-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 A1 3078 2975 44.49      
2 A1 1367 1320 35.29      
3 A1 517 500 3.65      
4 E 3217 3109 19.78      
4 E 3217 3109 19.78      
5 E 1471 1422 6.65      
5 E 1471 1422 6.65      
6 E 929 898 14.67      
6 E 929 898 14.67      

Unscaled Zero Point Vibrational Energy (zpe) 8098.5 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 7825.5 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 MP2/CEP-31G
ABC
5.06407 0.23762 0.23762

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.862
I2 0.000 0.000 0.336
H3 0.000 1.049 -2.205
H4 0.909 -0.525 -2.205
H5 -0.909 -0.525 -2.205

Atom - Atom Distances (Å)
  C1 I2 H3 H4 H5
C12.19711.10421.10421.1042
I22.19712.74902.74902.7490
H31.10422.74901.81741.8174
H41.10422.74901.81741.8174
H51.10422.74901.81741.8174

picture of methyl iodide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 H3 108.138 I2 C1 H4 108.138
I2 C1 H5 108.138 H3 C1 H4 110.771
H3 C1 H5 110.771 H4 C1 H5 110.771
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability