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

using model chemistry: HF/CEP-121G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at HF/CEP-121G
 hartrees
Energy at 0K-20.350986
Energy at 298.15K 
HF Energy-20.350986
Nuclear repulsion energy18.615261
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 HF/CEP-121G
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 3217 2935 35.03 146.02 0.00 0.01
2 A1 1473 1344 49.44 1.66 0.13 0.23
3 A1 603 550 29.70 54.56 0.33 0.49
4 E 3364 3070 12.74 67.70 0.75 0.86
4 E 3364 3070 12.74 67.70 0.75 0.86
5 E 1597 1457 6.42 18.82 0.75 0.86
5 E 1597 1457 6.42 18.82 0.75 0.86
6 E 1062 969 9.12 12.89 0.75 0.86
6 E 1062 969 9.12 12.89 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 8669.1 cm-1
Scaled (by 0.9125) Zero Point Vibrational Energy (zpe) 7910.5 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 HF/CEP-121G
ABC
5.26128 0.30535 0.30535

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/CEP-121G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.563
Br2 0.000 0.000 0.429
H3 0.000 1.029 -1.881
H4 0.892 -0.515 -1.881
H5 -0.892 -0.515 -1.881

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.99221.07741.07741.0774
Br21.99222.52922.52922.5292
H31.07742.52921.78301.7830
H41.07742.52921.78301.7830
H51.07742.52921.78301.7830

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 107.165 Br2 C1 H4 107.165
Br2 C1 H5 107.165 H3 C1 H4 111.676
H3 C1 H5 111.676 H4 C1 H5 111.676
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-121G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.615      
2 Br 0.016      
3 H 0.200      
4 H 0.200      
5 H 0.200      


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 -2.511 2.511
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.682 0.000 0.000
y 0.000 -22.682 0.000
z 0.000 0.000 -18.751
Traceless
 xyz
x -1.965 0.000 0.000
y 0.000 -1.965 0.000
z 0.000 0.000 3.931
Polar
3z2-r27.862
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 2.025 0.000 0.000
y 0.000 2.025 0.000
z 0.000 0.000 5.838


<r2> (average value of r2) Å2
<r2> 38.204
(<r2>)1/2 6.181