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

using model chemistry: B3LYP/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B3LYP/6-31G(2df,p)
 hartrees
Energy at 0K-2611.790695
Energy at 298.15K 
HF Energy-2611.790695
Nuclear repulsion energy89.246929
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 B3LYP/6-31G(2df,p)
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 3082 2974 15.02      
2 A1 1337 1290 19.72      
3 A1 616 595 10.96      
4 E 3186 3075 2.75      
4 E 3186 3075 2.75      
5 E 1477 1426 4.47      
5 E 1477 1426 4.47      
6 E 971 937 4.23      
6 E 971 937 4.23      

Unscaled Zero Point Vibrational Energy (zpe) 8152.0 cm-1
Scaled (by 0.965) Zero Point Vibrational Energy (zpe) 7866.7 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 B3LYP/6-31G(2df,p)
ABC
5.22772 0.32027 0.32027

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/6-31G(2df,p)

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 -1.860
H4 0.894 -0.516 -1.860
H5 -0.894 -0.516 -1.860

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.93601.08821.08821.0882
Br21.93602.50212.50212.5021
H31.08822.50211.78881.7888
H41.08822.50211.78881.7888
H51.08822.50211.78881.7888

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 108.376 Br2 C1 H4 108.376
Br2 C1 H5 108.376 H3 C1 H4 110.544
H3 C1 H5 110.544 H4 C1 H5 110.544
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.472      
2 Br -0.032      
3 H 0.168      
4 H 0.168      
5 H 0.168      


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 -1.845 1.845
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.378 0.000 0.000
y 0.000 -25.378 0.000
z 0.000 0.000 -21.872
Traceless
 xyz
x -1.753 0.000 0.000
y 0.000 -1.753 0.000
z 0.000 0.000 3.507
Polar
3z2-r27.013
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 3.971 0.000 0.000
y 0.000 3.971 0.000
z 0.000 0.000 5.830


<r2> (average value of r2) Å2
<r2> 48.653
(<r2>)1/2 6.975