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

using model chemistry: PM3

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
Energy calculated at PM3
 hartrees
Energy at 0K 
Energy at 298.15K-0.003190
HF Energy-0.003190
Nuclear repulsion energy35.140760
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 PM3
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 3207 3124 0.79 91.20 0.05 0.10
2 A1 1336 1301 93.99 17.82 0.17 0.29
3 A1 659 642 39.60 69.30 0.35 0.52
4 E 3159 3077 4.55 60.37 0.75 0.86
4 E 3159 3077 4.55 60.37 0.75 0.86
5 E 1369 1333 1.16 25.59 0.75 0.86
5 E 1369 1333 1.16 25.59 0.75 0.86
6 E 978 953 0.11 22.19 0.75 0.86
6 E 978 953 0.11 22.19 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 8106.5 cm-1
Scaled (by 0.974) Zero Point Vibrational Energy (zpe) 7895.8 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 PM3
ABC
5.21156 0.31551 0.31551

See section I.F.4 to change rotational constant units
Geometric Data calculated at PM3

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.528
Br2 0.000 0.000 0.423
H3 0.000 1.034 -1.874
H4 0.896 -0.517 -1.874
H5 -0.896 -0.517 -1.874

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.95111.09041.09041.0904
Br21.95112.51832.51832.5183
H31.09042.51831.79151.7915
H41.09042.51831.79151.7915
H51.09042.51831.79151.7915

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 108.448 Br2 C1 H4 108.448
Br2 C1 H5 108.448 H3 C1 H4 110.474
H3 C1 H5 110.474 H4 C1 H5 110.474
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability