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

using model chemistry: B3LYP/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 B3LYP/CEP-31G
 hartrees
Energy at 0K-20.821077
Energy at 298.15K 
HF Energy-20.821077
Nuclear repulsion energy18.313427
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/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 3091 2993 28.69      
2 A1 1345 1302 21.94      
3 A1 557 540 17.44      
4 E 3227 3125 20.55      
4 E 3227 3125 20.56      
5 E 1475 1428 11.21      
5 E 1475 1428 11.20      
6 E 960 929 12.35      
6 E 960 929 12.35      

Unscaled Zero Point Vibrational Energy (zpe) 8156.8 cm-1
Scaled (by 0.9684) Zero Point Vibrational Energy (zpe) 7899.0 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/CEP-31G
ABC
5.07081 0.29602 0.29602

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/CEP-31G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.588
Br2 0.000 0.000 0.436
H3 0.000 1.049 -1.909
H4 0.908 -0.524 -1.909
H5 -0.908 -0.524 -1.909

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C12.02371.09661.09661.0966
Br22.02372.56842.56842.5684
H31.09662.56841.81621.8162
H41.09662.56841.81621.8162
H51.09662.56841.81621.8162

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 107.016 Br2 C1 H4 107.016
Br2 C1 H5 107.016 H3 C1 H4 111.811
H3 C1 H5 111.811 H4 C1 H5 111.811
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/CEP-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.597      
2 Br -0.041      
3 H 0.213      
4 H 0.213      
5 H 0.213      


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 -2.337 2.337
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.503 0.000 0.000
y 0.000 -22.503 0.000
z 0.000 0.000 -18.351
Traceless
 xyz
x -2.076 0.000 0.000
y 0.000 -2.076 0.000
z 0.000 0.000 4.153
Polar
3z2-r28.306
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 1.887 0.000 0.000
y 0.000 1.887 0.000
z 0.000 0.000 5.751


<r2> (average value of r2) Å2
<r2> 38.834
(<r2>)1/2 6.232