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

using model chemistry: MP4/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-2612.541873
Energy at 298.15K 
HF Energy-2612.092238
Nuclear repulsion energy89.215802
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/cc-pVTZ
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 3086 2990        
2 A1 1339 1297        
3 A1 630 611        
4 E 3196 3098        
4 E 3196 3098        
5 E 1483 1437        
5 E 1482 1437        
6 E 966 937        
6 E 966 937        

Unscaled Zero Point Vibrational Energy (zpe) 8171.9 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 7920.2 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/cc-pVTZ
ABC
5.23694 0.31985 0.31985

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/cc-pVTZ

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.519
Br2 0.000 0.000 0.420
H3 0.000 1.032 -1.856
H4 0.894 -0.516 -1.856
H5 -0.894 -0.516 -1.856

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.93901.08531.08531.0853
Br21.93902.49852.49852.4985
H31.08532.49851.78721.7872
H41.08532.49851.78721.7872
H51.08532.49851.78721.7872

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 108.063 Br2 C1 H4 108.063
Br2 C1 H5 108.063 H3 C1 H4 110.842
H3 C1 H5 110.842 H4 C1 H5 110.842
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability