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

using model chemistry: MP3=FULL/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at MP3=FULL/3-21G*
 hartrees
Energy at 0K-2599.916756
Energy at 298.15K 
HF Energy-2599.663223
Nuclear repulsion energy88.112901
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 MP3=FULL/3-21G*
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 3123 3123 12.93      
2 A1 1421 1421 18.01      
3 A1 627 627 10.77      
4 E 3220 3220 4.09      
4 E 3220 3220 4.09      
5 E 1573 1573 6.83      
5 E 1573 1573 6.83      
6 E 1008 1008 6.40      
6 E 1008 1008 6.40      

Unscaled Zero Point Vibrational Energy (zpe) 8386.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 8386.6 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 MP3=FULL/3-21G*
ABC
5.18262 0.31128 0.31128

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP3=FULL/3-21G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.543
Br2 0.000 0.000 0.425
H3 0.000 1.037 -1.876
H4 0.898 -0.519 -1.876
H5 -0.898 -0.519 -1.876

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.96791.08931.08931.0893
Br21.96792.52382.52382.5238
H31.08932.52381.79651.7965
H41.08932.52381.79651.7965
H51.08932.52381.79651.7965

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 107.790 Br2 C1 H4 107.790
Br2 C1 H5 107.790 H3 C1 H4 111.099
H3 C1 H5 111.099 H4 C1 H5 111.099
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability