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

using model chemistry: MP4/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at MP4/6-31G*
 hartrees
Energy at 0K-2609.776274
Energy at 298.15K 
HF Energy-2609.500157
Nuclear repulsion energy88.268772
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 MP4/6-31G*
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 3113 2973        
2 A1 1378 1315        
3 A1 609 581        
4 E 3230 3084        
4 E 3230 3084        
5 E 1523 1454        
5 E 1522 1454        
6 E 986 941        
6 E 986 941        

Unscaled Zero Point Vibrational Energy (zpe) 8288.6 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 7913.9 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 MP4/6-31G*
ABC
5.16587 0.31267 0.31267

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/6-31G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.539
Br2 0.000 0.000 0.424
H3 0.000 1.039 -1.871
H4 0.900 -0.519 -1.871
H5 -0.900 -0.519 -1.871

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.96331.09071.09071.0907
Br21.96332.51962.51962.5196
H31.09072.51961.79941.7994
H41.09072.51961.79941.7994
H51.09072.51961.79941.7994

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 107.725 Br2 C1 H4 107.725
Br2 C1 H5 107.725 H3 C1 H4 111.160
H3 C1 H5 111.160 H4 C1 H5 111.160
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability