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

using model chemistry: B1B95/CEP-121G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B1B95/CEP-121G
 hartrees
Energy at 0K-18.836335
Energy at 298.15K 
HF Energy-18.836335
Nuclear repulsion energy17.636975
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 B1B95/CEP-121G
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 3070 3070 18.53      
2 A1 1331 1331 18.58      
3 A1 518 518 2.70      
4 E 3213 3213 7.58      
4 E 3213 3213 7.70      
5 E 1479 1479 11.96      
5 E 1479 1479 11.93      
6 E 921 921 17.93      
6 E 921 921 17.94      

Unscaled Zero Point Vibrational Energy (zpe) 8071.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 8071.4 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 B1B95/CEP-121G
ABC
5.18700 0.24354 0.24354

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/CEP-121G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.840
I2 0.000 0.000 0.331
H3 0.000 1.037 -2.174
H4 0.898 -0.518 -2.174
H5 -0.898 -0.518 -2.174

Atom - Atom Distances (Å)
  C1 I2 H3 H4 H5
C12.17171.08901.08901.0890
I22.17172.71102.71102.7110
H31.08902.71101.79581.7958
H41.08902.71101.79581.7958
H51.08902.71101.79581.7958

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 107.819 I2 C1 H4 107.819
I2 C1 H5 107.819 H3 C1 H4 111.072
H3 C1 H5 111.072 H4 C1 H5 111.072
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/CEP-121G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.820      
2 I 0.125      
3 H 0.232      
4 H 0.232      
5 H 0.232      


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 -1.758 1.758
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -28.232 0.000 0.000
y 0.000 -28.232 0.000
z 0.000 0.000 -22.896
Traceless
 xyz
x -2.668 0.000 0.000
y 0.000 -2.668 0.000
z 0.000 0.000 5.337
Polar
3z2-r210.673
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 2.205 0.000 0.000
y 0.000 2.208 -0.000
z 0.000 -0.000 7.032


<r2> (average value of r2) Å2
<r2> 48.236
(<r2>)1/2 6.945