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

using model chemistry: B3LYP/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 B3LYP/6-31G*
 hartrees
Energy at 0K-2611.616647
Energy at 298.15K 
HF Energy-2611.616647
Nuclear repulsion energy88.268784
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*
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 3107 2983 16.08      
2 A1 1355 1302 27.57      
3 A1 592 569 13.98      
4 E 3216 3089 3.60      
4 E 3216 3089 3.59      
5 E 1507 1447 5.31      
5 E 1507 1447 5.31      
6 E 972 933 5.92      
6 E 972 933 5.92      

Unscaled Zero Point Vibrational Energy (zpe) 8221.3 cm-1
Scaled (by 0.9603) Zero Point Vibrational Energy (zpe) 7895.0 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/6-31G*
ABC
5.18568 0.31249 0.31249

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/6-31G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.540
Br2 0.000 0.000 0.424
H3 0.000 1.037 -1.871
H4 0.898 -0.518 -1.871
H5 -0.898 -0.518 -1.871

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.96431.08851.08851.0885
Br21.96432.51882.51882.5188
H31.08852.51881.79601.7960
H41.08852.51881.79601.7960
H51.08852.51881.79601.7960

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 107.715 Br2 C1 H4 107.715
Br2 C1 H5 107.715 H3 C1 H4 111.169
H3 C1 H5 111.169 H4 C1 H5 111.169
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.462      
2 Br -0.136      
3 H 0.199      
4 H 0.199      
5 H 0.199      


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 -1.937 1.937
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.498 0.000 0.000
y 0.000 -25.498 0.000
z 0.000 0.000 -21.589
Traceless
 xyz
x -1.954 0.000 0.000
y 0.000 -1.954 0.000
z 0.000 0.000 3.909
Polar
3z2-r27.817
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 3.248 0.000 0.000
y 0.000 3.248 0.000
z 0.000 0.000 5.336


<r2> (average value of r2) Å2
<r2> 49.371
(<r2>)1/2 7.026