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

using model chemistry: B3PW91/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B3PW91/6-31G*
 hartrees
Energy at 0K-2611.586583
Energy at 298.15K 
HF Energy-2611.586583
Nuclear repulsion energy88.876780
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 B3PW91/6-31G*
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 3112 2978 16.06      
2 A1 1357 1298 21.59      
3 A1 612 585 12.58      
4 E 3227 3088 2.68      
4 E 3227 3088 2.68      
5 E 1502 1437 6.34      
5 E 1502 1437 6.34      
6 E 976 934 6.71      
6 E 976 934 6.71      

Unscaled Zero Point Vibrational Energy (zpe) 8246.1 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 7889.0 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 B3PW91/6-31G*
ABC
5.19406 0.31740 0.31740

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.526
Br2 0.000 0.000 0.421
H3 0.000 1.036 -1.861
H4 0.897 -0.518 -1.861
H5 -0.897 -0.518 -1.861

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.94711.08891.08891.0889
Br21.94712.50622.50622.5062
H31.08892.50621.79451.7945
H41.08892.50621.79451.7945
H51.08892.50621.79451.7945

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 107.915 Br2 C1 H4 107.915
Br2 C1 H5 107.915 H3 C1 H4 110.981
H3 C1 H5 110.981 H4 C1 H5 110.981
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.531      
2 Br -0.130      
3 H 0.221      
4 H 0.221      
5 H 0.221      


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 -1.939 1.939
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.413 0.000 0.000
y 0.000 -25.413 0.000
z 0.000 0.000 -21.514
Traceless
 xyz
x -1.949 0.000 0.000
y 0.000 -1.949 0.000
z 0.000 0.000 3.899
Polar
3z2-r27.798
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 3.261 0.000 0.000
y 0.000 3.261 0.000
z 0.000 0.000 5.275


<r2> (average value of r2) Å2
<r2> 48.848
(<r2>)1/2 6.989