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All results from a given calculation for CH3Br (methyl bromide)

using model chemistry: B1B95/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B1B95/6-31+G**
 hartrees
Energy at 0K-2611.928973
Energy at 298.15K 
HF Energy-2611.928973
Nuclear repulsion energy89.287513
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 B1B95/6-31+G**
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 3108 2973 17.08      
2 A1 1348 1289 22.30      
3 A1 618 591 11.85      
4 E 3225 3085 1.54      
4 E 3225 3085 1.54      
5 E 1477 1413 6.76      
5 E 1477 1413 6.76      
6 E 980 938 6.08      
6 E 980 938 6.08      

Unscaled Zero Point Vibrational Energy (zpe) 8219.3 cm-1
Scaled (by 0.9566) Zero Point Vibrational Energy (zpe) 7862.6 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 B1B95/6-31+G**
ABC
5.22542 0.32054 0.32054

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/6-31+G**

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.517
Br2 0.000 0.000 0.419
H3 0.000 1.033 -1.855
H4 0.895 -0.516 -1.855
H5 -0.895 -0.516 -1.855

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.93641.08671.08671.0867
Br21.93642.49752.49752.4975
H31.08672.49751.78911.7891
H41.08672.49751.78911.7891
H51.08672.49751.78911.7891

picture of methyl bromide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Br2 C1 H3 108.092 Br2 C1 H4 108.092
Br2 C1 H5 108.092 H3 C1 H4 110.814
H3 C1 H5 110.814 H4 C1 H5 110.814
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.416      
2 Br -0.164      
3 H 0.193      
4 H 0.193      
5 H 0.193      


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 -2.033 2.033
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.945 0.000 0.000
y 0.000 -25.945 0.000
z 0.000 0.000 -21.966
Traceless
 xyz
x -1.989 0.000 0.000
y 0.000 -1.989 0.000
z 0.000 0.000 3.979
Polar
3z2-r27.957
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 3.786 0.000 0.000
y 0.000 3.786 0.000
z 0.000 0.000 5.768


<r2> (average value of r2) Å2
<r2> 48.860
(<r2>)1/2 6.990